Azure Authentication for Windows Phone Silverlight 8.0 in Xamarin.Forms

Using https://blog.xamarin.com/put-adal-xamarin.forms/ we have implemented authentication for iOS in a Xamarin.Forms project.
The blog post mentions that implementation for Windows Phone Silverlight 8.0 requires a different approach, but nothing regarding what this approach is.

Including the Microsoft.IdentityModel.Clients.ActiveDirectory 3.5 package in the phone library fails to build.

Any help is greatly appreciated.