Auth::check() is always false in middleware in Laravel 5.7

I have used middlewares for many Laravel applications, but this is a stupid situation never happened to me before. The middleware always returns false for Auth::check()

This is routes of User module

<?php
Route::group(['middleware' => 'web', 'namespace' => 'Modules\User\Http\Controllers'], function () {
    Route::get('/', 'UserController@index');
    Route::get('login', 'LoginController@showLoginForm')->name('login');
    Route::post('login', 'LoginController@login');
    Route::post('logout', 'LoginController@logout')->name('logout');
});
Route::group(['middleware' => 'admin', 'prefix' => 'user', 'namespace' => 'Modules\User\Http\Controllers'], function () {
    Route::get('register', 'RegisterController@showRegistrationForm')->name('register');
    Route::post('register', 'RegisterController@register');
});

This is AdminMiddleware inside the User module

<?php

namespace Modules\User\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class AdminMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $log = Auth::check();
        dd($log);
        return $next($request);
    }
}

and this is kernel.php

protected $routeMiddleware = [
    'auth' => \App\Http\Middleware\Authenticate::class,
    'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
    'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
    'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
    'can' => \Illuminate\Auth\Middleware\Authorize::class,
    'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
    'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
    'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
    'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
    'admin' => \Modules\User\Http\Middleware\AdminMiddleware::class
];

But the result of dd($log) is always false. What is wrong here?!!!

via Chebli Mohamed