function Set-IntuneDevicePrimaryUser not working, Bad Request

[pheasantus]

Win10_PrimaryUser_Set.ps1
function Set-IntuneDevicePrimaryUser not working, throws,
Response content:
{"error":{"code":"BadRequest","message":"Write requests are only supported on contained entities or navigation properties with bindings.","innerError":{"date":"2023-02-23T16:
33:21","request-id":"95d961d2-843b-4d5e-9329-86ed60f5c9d1","client-request-id":"95d961d2-843b-4d5e-9329-86ed60f5c9d1"}}}
pheasant@domain.onmicrosoft.com AzureCloud c4401c5a-3f02-4a4a-a660-3943af27c558 domain.onmicrosoft.com User
Set-IntuneDevicePrimaryUser : Request to https://graph.microsoft.com/beta/deviceManagement/managedDevices('DEV_ID')/users/ failed with HTTP Status BadRequest Bad Request