Estou tentando criar um login com fb no meu aplicativo em Xamarin. O problema é que o Fb não retorna o e mail e as permissões estão todas habilitadas no painel do Fb, o identify e id retornam. Ja tentei varias urls e nada. Estou tentando seguir esse exemplo

Testei a URL no browser e tbm não retorna o e mail.

Como resolver isso ?

Estou tentando assim.

utilizing System;
utilizing Xamarin.Types;
utilizing Xamarin.Types.Platform.Android;
utilizing Android.App;
utilizing Xamarin.Auth;
utilizing Newtonsoft.Json.Linq;
utilizing MyApp.View;

[assembly: ExportRenderer(typeof(LoginFacebookView), typeof(MyApp.Droid.FBLoginPageRenderer))]

namespace MyApp.Droid
{
    public class FBLoginPageRenderer : PageRenderer 
    {
        public FBLoginPageRenderer()
        {
            var exercise = this.Context as Exercise;

            var auth = new OAuth2Authenticator(
                clientId: "2xxxxxxxxxxxxxxxx3", 
                scope: "", 
                authorizeUrl: new Uri("https://m.fb.com/dialog/oauth/"),
                redirectUrl: new Uri("http://www.fb.com/join/login_success.html"));

            auth.Accomplished += async (sender, eventArgs) => {
                if (eventArgs.IsAuthenticated)
                {
                    var accessToken = eventArgs.Account.Properties["access_token"].ToString();
                    //Console.WriteLine(accessToken);
                    var expiresIn = Convert.ToDouble(eventArgs.Account.Properties["expires_in"]);
                    var expiryDate = DateTime.Now + TimeSpan.FromSeconds(expiresIn);

                    //var request = new OAuth2Request("GET", new Uri("https://graph.fb.com/me/permissions?access_token=" + accessToken + "&debug=all"), null, eventArgs.Account);
                    //var request = new OAuth2Request("GET", new Uri("https://graph.fb.com/me?fields=e mail&access_token=" + accessToken), null, eventArgs.Account);
                    //var request = new OAuth2Request("GET", new Uri("https://graph.fb.com/me?fields=id,identify,e mail"), null, eventArgs.Account);
                    var request = new OAuth2Request("GET", new Uri("https://graph.fb.com/v2.9/me?fields=id,identify,e mail"), null, eventArgs.Account);
                    var response = await request.GetResponseAsync();

                    Console.WriteLine(response.GetResponseText());

                    //var obj = JObject.Parse(response.GetResponseText());

                    //var id = obj["id"].ToString().Exchange(""", "");
                    //var identify = obj["name"].ToString().Exchange(""", "");
                    //var e mail = obj["email"].ToString().Exchange(""", "");

                    // Console.WriteLine("Nome: " + identify + ", e mail: " + e mail);

                    //await App.NavigateToProfile(string.Format("Olá {0}, seja bem-vindo", identify));
                }
                else
                {
                    //await App.NavigateToProfile("O usuário Cancelou o login");
                }
            };

            exercise.StartActivity(auth.GetUI(exercise));
        }
    }
}