Cakephp authentication plugin how can I implement login in admin prefix? - cakephp

Question

I'm trying to implement cakephp authentication plugin in admin prefix
Route I have written for admin prefix
$routes->prefix('admin', function (RouteBuilder $routes) {
$routes->connect('/',['controller'=>'AdminUsers','action'=>'login']);
$routes->fallbacks(DashedRoute::class);
});
In application.php , I have followed everything That mentioned in authentication documentation
public function getAuthenticationService(ServerRequestInterface $request): AuthenticationServiceInterface
{
$authenticationService = new AuthenticationService([
'unauthenticatedRedirect' => Router::url('/admin'),
'queryParam' => 'redirect',
]);
// Load identifiers, ensure we check email and password fields
$authenticationService->loadIdentifier('Authentication.Password', [
'fields' => [
'username' => 'email',
'password' => 'password',
]
]);
// Load the authenticators, you want session first
$authenticationService->loadAuthenticator('Authentication.Session');
// Configure form data check to pick email and password
$authenticationService->loadAuthenticator('Authentication.Form', [
'fields' => [
'username' => 'email',
'password' => 'password',
],
'userModel' => 'AdminUsers',
'loginUrl' => Router::url('/admin'),
]);
return $authenticationService;
}
I have changed users model to AdminUsers for database table admin_users
Now in admin/appController.php
I have loadComponent in initialize method
$this->loadComponent('Authentication.Authentication');
In before filter method I have added
$this->Authentication->allowUnauthenticated(['login']);
Now after submit login form I am getting error
Table class for alias Users could not be found.
In getAuthenticationService method I have changed model Users to AdminUsers. Why it's going for Users model rather then AdminUsers model ?
My Table/AdminUsersTable.php table class look likes
<?php
declare(strict_types=1);
namespace App\Model\Table;
use Cake\ORM\Query;
use Cake\ORM\RulesChecker;
use Cake\ORM\Table;
use Cake\Validation\Validator;
class AdminUsersTable extends Table
{
public function initialize(array $config): void
{
parent::initialize($config);
$this->setTable('admin_users');
--------
After ndm comment I am able to change default model in application.php , But how can I change it in Admin/AppController.php ? Code that I have tried.
public function beforeFilter(EventInterface $event)
{
$service = new AuthenticationService();
$service->loadIdentifier('Authentication.Password', [
'resolver' => [
'className' => 'Authentication.Orm',
'userModel' => 'AdminUsers',
],
]);
$this->Authentication->allowUnauthenticated(['login','signup']);
$this->viewBuilder()->setLayout('admin');
}