[Bug] PlatformNotSupportedException in AcquireTokenInteractive call

Which Version of MSAL are you using ? Note that to get help, you need to run the latest version. Preview version are also ok. For ADAL, please log issues to https://github.com/AzureAD/azure-activedirectory-library-for-dotnet

4.16.0 Platform

netstandard2.0 What authentication flow has the issue?

• Desktop / Mobile
  • Interactive
  • Integrated Windows Auth
  • Username Password
  • Device code flow (browserless)
• Web App
  • Authorization code
  • OBO
• Web API
  • OBO

Other? - please describe;

Is this a new or existing app?

This is a new app or experiment Repro

 authResult = await app.AcquireTokenInteractive(scopes)
                .ExecuteAsync().ConfigureAwait(false);

Expected behavior A clear and concise description of what you expected to happen (or code). Interactive UI pop-up should show up for sign-in. Actual behavior A clear and concise description of what happens, e.g. exception is thrown, UI freezes
Following exception is thrown: System.PlatformNotSupportedException HResult=0x80131539 Message=Possible Cause: If you are using an XForms app, or generally a netstandard assembly, make sure you add a reference to Microsoft.Identity.Client.dll from each platform assembly (e.g. UWP, Android, iOS), not just from the common netstandard assembly Source=Microsoft.Identity.Client StackTrace: at Microsoft.Identity.Client.Platforms.netstandard13.WebUIFactory.CreateAuthenticationDialog(CoreUIParent parent, RequestContext requestContext) at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.CreateWebAuthenticationDialog() at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.<FetchAuthCodeAndPkceVerifierAsync>d__4.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.<GetTokenResponseAsync>d__11.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.<ExecuteAsync>d__8.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Identity.Client.Internal.Requests.RequestBase.<RunAsync>d__14.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.Identity.Client.ApiConfig.Executors.PublicClientExecutor.<ExecuteAsync>d__2.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult() at Microsoft.DevCanvas.Common.Providers.AuthZMsalProvider.<GetInteractiveFlowToken>d__2.MoveNext() in D:\devcanvas\Analyzers\Analyzers\Extensions\AuthZMsalProvider.cs:line 41

This exception was originally thrown at this call stack: [External Code] Microsoft.DevCanvas.Common.Providers.AuthZMsalProvider.GetInteractiveFlowToken() in AuthZMsalProvider.cs

Possible Solution

Additional context/ Logs / Screenshots Add any other context about the problem here, such as logs and screebshots. Logging is described at https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/wiki/logging

[bgavrilMS]

Hi @ShaneOss - for mobile plantforms and UWP, MSAL takes care of the token cache for you:

• on UWP it stores in it encrypted at rest (with DPAPI) in a file
• on iOS it stores it in KeyChain
• on Android in SharedPreferences

On other runtimes, we ask developers to define where the cache is stored etc.

https://docs.microsoft.com/en-us/azure/active-directory/develop/msal-net-token-cache-serialization?tabs=mobile

[bgavrilMS]

I do not recommed it, it will not be easy to implement. Let’s continue the discussion on Discussions tab.