diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-04-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-04-01/managedClusters.json
index fb24414f041a..49f59d3be75c 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-04-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-04-01/managedClusters.json
@@ -1386,13 +1386,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-06-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-06-01/managedClusters.json
index da7e5b3496df..c476b8355ae6 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-06-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-06-01/managedClusters.json
@@ -1488,13 +1488,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-08-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-08-01/managedClusters.json
index d50dcee822ab..d336ac2148f8 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-08-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-08-01/managedClusters.json
@@ -1532,13 +1532,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-10-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-10-01/managedClusters.json
index 585ad556f9e0..b218cd442c75 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-10-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-10-01/managedClusters.json
@@ -1575,13 +1575,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-11-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-11-01/managedClusters.json
index 8ebd1e442d6b..0be553652cb2 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-11-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2019-11-01/managedClusters.json
@@ -1589,13 +1589,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-01-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-01-01/managedClusters.json
index 83a3690c1e3d..9052f5a6c66f 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-01-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-01-01/managedClusters.json
@@ -1589,13 +1589,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-02-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-02-01/managedClusters.json
index 656eceb27f8d..4572d2dec90e 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-02-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-02-01/managedClusters.json
@@ -1596,13 +1596,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
index f23476495830..772ab033df01 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-03-01/managedClusters.json
@@ -1612,13 +1612,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-04-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-04-01/managedClusters.json
index e8797a360276..3a813866b029 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-04-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-04-01/managedClusters.json
@@ -1630,13 +1630,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-06-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-06-01/managedClusters.json
index 0a3991450f28..b953c50c7963 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-06-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-06-01/managedClusters.json
@@ -1842,13 +1842,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         }
       },
       "required": [
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-07-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-07-01/managedClusters.json
index 5a07097c6d67..d1c2f34c1d52 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-07-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-07-01/managedClusters.json
@@ -1900,13 +1900,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         },
         "licenseType": {
           "type": "string",
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-09-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-09-01/managedClusters.json
index be924c99384f..aa5a00d3e6c5 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-09-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-09-01/managedClusters.json
@@ -2095,13 +2095,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         },
         "licenseType": {
           "type": "string",
diff --git a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
index 05e3156abf81..696affb6f350 100644
--- a/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
+++ b/specification/containerservice/resource-manager/Microsoft.ContainerService/stable/2020-11-01/managedClusters.json
@@ -2099,13 +2099,11 @@
       "properties": {
         "adminUsername": {
           "type": "string",
-          "description": "The administrator username to use for Windows VMs.",
-          "pattern": "^[a-zA-Z0-9]+([._]?[a-zA-Z0-9]+)*$"
+          "description": "Specifies the name of the administrator account. <br><br> **restriction:** Cannot end in \".\" <br><br> **Disallowed values:** \"administrator\", \"admin\", \"user\", \"user1\", \"test\", \"user2\", \"test1\", \"user3\", \"admin1\", \"1\", \"123\", \"a\", \"actuser\", \"adm\", \"admin2\", \"aspnet\", \"backup\", \"console\", \"david\", \"guest\", \"john\", \"owner\", \"root\", \"server\", \"sql\", \"support\", \"support_388945a0\", \"sys\", \"test2\", \"test3\", \"user4\", \"user5\". <br><br> **Minimum-length:** 1 character <br><br> **Max-length:** 20 characters"
         },
         "adminPassword": {
           "type": "string",
-          "description": "The administrator password to use for Windows VMs.",
-          "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%\\^&\\*\\(\\)])[a-zA-Z\\d!@#$%\\^&\\*\\(\\)]{12,123}$"
+          "description": "Specifies the password of the administrator account. <br><br> **Minimum-length:** 8 characters <br><br> **Max-length:** 123 characters <br><br> **Complexity requirements:** 3 out of 4 conditions below need to be fulfilled <br> Has lower characters <br>Has upper characters <br> Has a digit <br> Has a special character (Regex match [\\W_]) <br><br> **Disallowed values:** \"abc@123\", \"P@$$w0rd\", \"P@ssw0rd\", \"P@ssword123\", \"Pa$$word\", \"pass@word1\", \"Password!\", \"Password1\", \"Password22\", \"iloveyou!\""
         },
         "licenseType": {
           "type": "string",