How to Using Graph AD For Azure B2C in Xamarin Forms ?

Question

Im Trying to get email in b2c with Graph AD in xamarin forms , because authentication result in microsoft.identity.client dont provide that . So i try this code that i make but i didnt get the display name and email that i want to get. Im able to login and get the Token but the label its not change. what is wrong in here ? i tought my code will work

 here is my code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Identity.Client;
using Newtonsoft.Json.Linq;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace GetUserProfile
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class GetUsersPage : ContentPage
{
public GetUsersPage()
{
InitializeComponent();
}
protected override async void OnAppearing()
{
// let's see if we have a user in our belly already
try
{
var result = await App.AuthenticationClient.AcquireTokenSilentAsync(Constants.Scopes);
UsersInfo(result.Token);
await DisplayAlert("OK", "OK", "OK");

// await DisplayAlert("OK", "OK", "OK");

}
catch
{
// doesn't matter, we go in interactive more

}
}


private async void GetUserInfo(object sender, EventArgs e)
{
try
{

var result = await App.AuthenticationClient.AcquireTokenAsync(
Constants.Scopes,
string.Empty,
UiOptions.SelectAccount,
string.Empty,
null,
Constants.Authority,
Constants.SignUpSignInPolicy);
UsersInfo(result.Token);
// RefreshUserData(result.Token);
//btnSignInSignOut.Text = "Sign out";
await DisplayAlert("OK", "OK", "OK");

}
catch (Exception)
{
//
}


}

public async void UsersInfo(string token)
{
var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Get,
"https://graph.windows.net/me?api-version=1.6");
request.Headers.Authorization =
new AuthenticationHeaderValue("Bearer", token);
var response = await client.SendAsync(request);
var content = await response.Content.ReadAsStringAsync();
if (response.IsSuccessStatusCode)
{
JObject user = JObject.Parse(content);


lbldisplayname.Text = user["displayName"].ToString();
lblmail.Text = user["otherMails"].ToString();


// just in case
// btnSignInSignOut.Text = "Sign out";


}
else
{
lbldisplayname.Text = "Damnit Its Failed";
//DisplayAlert("Something went wrong with the API call", responseString, "Dismiss");
}
}
}
}