Example of authentication using ADFS 3.0 (2012 R2) and OAuth2
Don't forget to init submodules (Customized Xamarin.Auth)
$ git submodule init
$ git submodule update
In file Droid/Presentation/ADLoginPageRenderer.cs and iOS/Presentation/ADLoginPageRenderer.cs, replace the placeholders by your own values for clientId, resource, adfsHost and callbackUrl.
Example works with iOS simulator 8.4, Android SDK 22