Socialite redirect the user after successful facebook registeration

I'm using Laravel 5.5 and using Socialite to register users via facebook, this is my handleProviderCallback

public function handleProviderCallback(Request $request)
{
  $state = $request->get('state');
  $request->session()->put('state',$state);
  session()->regenerate();
  $user = Socialite::driver('facebook')->user();
  $userInsert = new User();
  $userInsert->name = $user->getName();
  $userInsert->email = $user->getEmail();
  $userInsert->password = bcrypt('password');
  $userInsert->save();
  return redirect()->guest('admin/dashboard');
}

the user is inserted successfully in the database but i can't redirect him to "admin/dashboard" how to do it.

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