Xamarin Forms with Xamarin Player OAuth2 NInterpre

问题:

I'm currently on developing some little application for iOS and Android. Therefore I need an OAuth2 authentication.

How I proceeded (from here)

1. Create a new Xamarin.Forms project from the templates with the default Item and About page
2. Add Dependency for Xamarin.Auth

3. Use the button on the about page to trigger a function with the following:

           var authenticator = new OAuth2Authenticator(
                                                   "CLIENTID"
                                                   ,
                                                   "SCOPE",
                                                   new
                                                       Uri("AUTH_URL"),
                                                   new Uri("REDIRECT_URL)
                                                   null,
                                                   true);
   

4. Add the iOS initializer in the AppDelegate.cs global::Xamarin.Auth.Presenters.XamarinIOS.AuthenticationConfiguration.Init();
5. Add the URL Types in Info.plist

I'm using the Xamarin Live Player to deploy this on my iPhone 7. When I'm triggering the button, I get the following error message:
Uncaught Exception: Bad convert with overflow instruction 'IL_0001: conv.ovf.i.un' (NInterpretExcetion)

Some ideas how to fix this?