laravel5.5のマルチログインで利用モデルが切り替わっていなさそうなとき確認すべき場所

前提・実現したいこと

laravel5.5にてマルチログインを実装したい

発生している問題・エラーメッセージ

Users以外に使いたいAdmin（管理者ログイン）ページからログインしようとすると下記のようなメッセージが表示されます
http://local.test_app/admin/login

These credentials do not match our records.

該当のソースコード

ルート

Auth::routes();


//1) User 認証不要
Route::get('/', function () { return redirect('/home'); });
 
//2) User ログイン後
Route::group(['middleware' => 'auth:user'], function() {
    Route::get('/home', 'HomeController@index')->name('home');
});
 
//3) Admin 認証不要
Route::group(['prefix' => 'admin'], function() {
    Route::get('/',         function () { return redirect('/admin/home'); });
    Route::get('login',     'Admin\LoginController@showLoginForm')->name('admin.login');
    Route::post('login',    'Admin\LoginController@login');
});
 
//4) Admin ログイン後
Route::group(['prefix' => 'admin', 'middleware' => 'auth:admin'], function() {
    Route::post('logout',   'Admin\LoginController@logout')->name('admin.logout');
    Route::get('home',      'Admin\HomeController@index')->name('admin.home');
});

Admin.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class Admin extends Authenticatable
{
    use Notifiable;

    protected $fillable = [
        'name', 'email', 'password',
    ];

    protected $hidden = [
        'password', 'remember_token',
    ];
}

config/auth

<?php

return [

    'defaults' => [
        'guard' => 'user',
        'passwords' => 'users',
    ],

    'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'users',
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'users',
        ],
        'user' => [
            'driver' => 'session',
            'provider' => 'users',
        ],
        'admin' => [
            'driver' => 'session',
            'provider' => 'admins',
        ],
    ],

    'providers' => [
        'users' => [
            'driver' => 'eloquent',
            'model' => App\User::class,
        ],
        'admins' => [
            'driver' => 'eloquent',
            'model' => App\Admin::class,
        ],
    ],

    'passwords' => [
        'users' => [
            'provider' => 'users',
            'table' => 'password_resets',
            'expire' => 60,
        ],

        'admins' => [
            'provider' => 'admins',
            'table' => 'password_resets',
            'expire' => 60,
        ],
    ],

];

Admin/LoginController

<?php

namespace App\Http\Controllers\Admin;

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

class LoginController extends Controller
{

    use AuthenticatesUsers;

    protected $redirectTo = '/admin/home';

    public function __construct()
    {
        $this->middleware('guest:admin')->except('logout');
    }
    public function showLoginForm()
    {
        return view('admin.login');
    }
 
    protected function guard()
    {
        return Auth::guard('admin');
    }
    
    public function logout(Request $request)
    {
        Auth::guard('admin')->logout();
        $request->session()->flush();
        $request->session()->regenerate();
 
        return redirect('/admin/login');
    }
}

Admin/HomeController

<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;

class HomeController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth:admin');
    }

    public function index()
    {
        return view('admin.home');
    }
}

Viewはadminディレクトリを新たに作りそこに既存のログインページとHomeページをコピーしRouteの部分をadmin.xxxxxに変更してあります