iOS Web Authentication Broker causes InvalidOperationException if dialog is cancelled.

[Vespion]

Current behavior

When using OIDC to authenticate on iOS, the system will show a dialog asking if the uses want's to use X website to login.

If the user presses the cancel button then the WebAuthenticationBrokerProvider will throw a InvalidOperationException with the message An attempt was made to transition a task to a final state when it had already completed.

Expected behavior

Cancelling this dialog should return an unauthenticated result without throwing an exception in the Main.iOS class.

How to reproduce it (as minimally and precisely as possible)

• Add an OIDC configuration to the project config file
• Run the project with the iOS head
• Press the login button
• When the dialog appears, press cancel
• The InvalidOperationException will be thrown from the Main.iOS class

Minimal Repo
BugReport.zip

Workaround

Add a try catch statement to the Main.iOS class.
This will prevent the app immediately crashing out but is a bit of a kludge fix.

Works on UWP/WinUI

Yes

Environment

Uno.UI.DevServer / Uno.WinUI.DevServer, Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia

NuGet package version(s)

Packages installed using the SDK (version 5.6.70)

Affected platforms

iOS, Mac Catalyst

IDE

Rider macOS

IDE version

2024.3.6

Relevant plugins

No response

Anything else we need to know?

No response