Laravel 5.4 Multi auth - Auth :: guard（） - > user（）为空

I've created a multi auth test in Laravel 5.4. It's using custom middlewares, custom Eloquent providers, etc. The auth flow is working, I can login in both ways. But if the user is signed in, in the home controller when I want to check the user with Auth::user() or Auth::guard()->user(), it's empty. The Auth::guard() is empty as well. But I don't understand, why?! It should contains the signed in user instance, shouldn't it?

Also the $request->getUserResolver() says that the guard is null... o.O

What did I do wrong?

Here it is my test repo, if you want to check my code.

Thank you in advance!

Edit 1:

In the \app\Http\Controllers\Employee\HomeController.php the Auth::guard()->user() and the Auth::user() are empty.

namespace App\Http\Controllers\Employee;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class HomeController extends Controller
{

    public function __construct(Request $request)
    {
        $this->middleware('auth.employee:employee');
    }

    public function index(Request $request)
    {
        $users[] = Auth::user();
        $users[] = Auth::guard()->user();
        $users[] = Auth::guard('employee')->user();

        dd($users);

        return view('employees.home.index');
    }
}

Auth::shouldUse(your_guard_name);
call this in your login function

Change the driver name in the config/auth.php as..

'employees' => [
        'driver' => 'eloquent',
        'model' => App\Models\UserEmployee::class,
    ],
    'customers' => [
        'driver' => 'eloquent',
        'model' => App\Models\Customer::class,
    ],