WinUI support for CoreWebView2EnvironmentOptions: UWP unable to enable webview2 support for SSO

[JRawlins737]

I am trying to put together a test UWP app to validate webview2 integration with SSO (AzureAD) does in fact handle Conditional access checks. The code below is taken from that UWP app where the EnsureCoreWebView2Async method does not allow any parameters (the environment parameter is needed)... Built a WPF version and the parameter works fine... unfortunately, I need this to work in UWP.

CoreWebView2EnvironmentOptions options = new CoreWebView2EnvironmentOptions()
{
    AllowSingleSignOnUsingOSPrimaryAccount = true
};

CoreWebView2Environment environment = await CoreWebView2Environment.CreateWithOptionsAsync("", "", options);
            
await webview.EnsureCoreWebView2Async(environment); //<-- Method does not support the parameter to set the environment

webview.Source = new Uri("https://www.yammer.com");

Visual Studio: 16.9.0 Preview 2.0
WinUI3 Version: 3.0.0-preview3.201113.0
Runtime: Version 89.0.731.0 (Official build) dev (64-bit)
Framework: UWP
OS: Version 10.0.19041.685

Repro Steps

1. Create a UWP App Add a Webview2 to the mainpage xaml, name it "webview"
2. Paste this into the mainpage.xaml.cs:

public MainPage()
        {
            this.InitializeComponent();

            this.Loaded += MainPage_Loaded;
        }

        private async void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            CoreWebView2EnvironmentOptions options = new CoreWebView2EnvironmentOptions()
            {
                AllowSingleSignOnUsingOSPrimaryAccount = true
            };

            CoreWebView2Environment environment = await CoreWebView2Environment.CreateWithOptionsAsync("", "", options);
            
            await webview.EnsureCoreWebView2Async(environment);

            webview.Source = new Uri("https://www.yammer.com");

        }

You'll notice Ensure.... is not happy.. Works fine with WPF.

Screenshots

Additional context

AB#33760896

[pranavchaturvedi-007]

We are facing the same issue in our UWP Application, please provide a fix for this ASAP !!

[wbokkers]

Please fix this for WinUI 3 as well.

[sparkrod]

Any update on this? I am attempting to work around this in UWP using the browser arguments:

Environment.SetEnvironmentVariable("WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS", "--enable-features=msSingleSignOnOSForPrimaryAccountIsShared");

Is this the correct approach? Should I also enable the UWP app capability enterpriseCloudSSO for Azure AD account use?

[champnic]

@sparkrod Yes that's the correct workaround for this. We already have this work tracked internally and on the WinUI team. Related to #2933

[champnic]

This work has been completed by the WinUI team:
https://learn.microsoft.com/en-us/windows/apps/windows-app-sdk/stable-channel#webview2-support-for-custom-environmentoptions
https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.controls.webview2.ensurecorewebview2async?view=windows-app-sdk-1.5