[Bug] MSAL not working with MAUI in iOS

Logs and network traces https://pastebin.com/B7ux36cs (anonymized) and then https://pastebin.com/1tJTqDWE

Which version of MSAL.NET are you using? Microsoft.Identity.Client 4.39.0

Platform .NET MAUI preview 11 running on iOS

What authentication flow has the issue?

• Desktop / Mobile
  • Interactive
  • Integrated Windows Authentication
  • Username Password
  • Device code flow (browserless)
• Web app
  • Authorization code
  • On-Behalf-Of
• Daemon app
  • Service to Service calls

Is this a new or existing app? This is a new app, but the same code does work in Xamarin.Forms/.iOS.

Repro

Create a .NET MAUI app from the default template, add MSAL and try to log in with AAD B2C. I use the following code to bootstrap MSAL:

AuthClient = PublicClientApplicationBuilder.Create(AuthConstants.ClientId)
		.WithIosKeychainSecurityGroup(AuthConstants.IosKeychainSecurityGroups)
		.WithB2CAuthority($"{AuthConstants.Authority}{AuthConstants.SigninPolicy}")
		.WithRedirectUri($"msal{AuthConstants.ClientId}://auth")
		.Build();

and

var result = await AuthClient
				.AcquireTokenInteractive(AuthConstants.DefaultScopes)
				.WithPrompt(Prompt.SelectAccount)
				.WithUseEmbeddedWebView(true)
				.ExecuteAsync().ConfigureAwait(false);

Expected behavior To get a AuthenticationResult like on Windows/Android.

Actual behavior Browser is closed and the debug log logs the attached exception and no user is logged in.

Additional context / logs / screenshots / links to code

[chrfin]

@bgavrilMS I just updated to MAUI preview 12 and now it does not compile anymore, as it does not find `AuthenticationContinuationHelper`.

I guess this is because MAUI does not support the Xamarin.iOS TFMs anymore (see here) and uses another more common one, which does not have this class.

[chrfin]

Thank you for the update. I will finish the Android version of the app first to get something out to testers and then look into iOS again and see if I’m able to contribute something 😊.