Firebase not working on my website when opening from mobile devices

in my website Signup page i'm using firebase auth for web ( @angular/fire version for angular websites ) to signup a user using Google Signup, i'm doing this using the SignInWithPopup function.

this is my AuthService class :

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(
    private afAuth: AngularFireAuth,