@akamud Here is how I’ve been getting around this

[Activity(Label = "CustomUrlSchemeInterceptorActivity", NoHistory = true, LaunchMode = LaunchMode.SingleTop)]
    [IntentFilter(
        new[] { Intent.ActionView },
        Categories = new[] { Intent.CategoryDefault, Intent.CategoryBrowsable },
        DataSchemes = new[] { "myapplogin" },
        DataPath = "/oauth2redirect")]
    public class CustomUrlSchemeInterceptorActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Convert Android.Net.Url to Uri
            global::Android.Net.Uri uri = Intent.Data;
           //This is the part that hides the Custom Tabs message
            CustomTabsConfiguration.CustomTabsClosingMessage = null;
            Uri uri_netfx = new Uri(uri.ToString());

            // Load redirectUrl page
            AppAuth.Authenticator.OnPageLoading(uri_netfx);

            //This is what forces the page to close.
            var intent = new Intent(this, typeof(MainActivity));
            intent.SetFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop);
            StartActivity(intent);

            this.Finish();

            return;
        }
    }

AuthTest.zip Here is a complete minimal sample with google login, showing that the login-browser doesn’t Close after successfully completing the login process.

Is anyone working on this?

Can you please tell us about this issue status? Should I use hacks to handle the issue myself or somebody gonna fix it soon in library?

Moving it to High Priority

In order to speed up the bugfixing, please add link to the repo with minimal sample (with removed sensitve data)

To switch back to the previous activity I used

var intent = new Intent(this, typeof(MainActivity)).SetFlags(ActivityFlags.ReorderToFront);
StartActivity(intent);

instead of

Finish();

@newky2k Still the same with latest version