generate a unique token for each user account on login xamarin.forms - xamarin.forms

Question

i am trying to create a messaging app using xamarin.forms and fcm. i am trying to create a token for each user upon login. i am using the same device to login to each user. the thing is that same token is being genberated. this is my code:
in xamarin.android project in MainActivity.cs:
public static FirebaseApp app ;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
string userid = Preferences.Get("userid", "");
FirebaseOptions options = new FirebaseOptions.Builder().SetApplicationId("my_app_id").SetApiKey("my_api_key").SetProjectId("my_project_id").Build();
app = FirebaseApp.InitializeApp(this, options, "User" + userid);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
and this is my getToken class
using Android.App;
using Android.Content;
using Android.Gms.Extensions;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Firebase.Iid;
using LearningWithCassidy;
using LearningWithCassidy.Droid;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
[assembly: Xamarin.Forms.Dependency(typeof(GetTokenAndroid))]
namespace LearningWithCassidy.Droid
{
internal class GetTokenAndroid:GetToken
{
public async Task<string> get_token()
{
FirebaseInstanceId firebaseInstanceId = FirebaseInstanceId.GetInstance(MainActivity.app);
var instanceIdResult = await firebaseInstanceId.GetInstanceId().AsAsync<IInstanceIdResult>();
var token = instanceIdResult.Token;
return token;
}
}
}
and this is how i get the token in my MainPage.xaml.cs
string token="";
token = await DependencyService.Get<GetToken>().get_token();
System.Diagnostics.Debug.WriteLine($"Token: {token}");
what am i doing wrong? why do i keep getting the same token?
thanks in advance

Answer 1

You have to delete the current token using deleteToken() whenever a user logs out. This will invalidate the token of the old user. Then, generate a new one after a new user logs in.