Laravel 7. Attempt method return false - php

Question

I hope my english is good enough to explain my problem. I'm working with laravel 7, and I'm trying to implement my own AuthController, because I can't use migrations and I can't use a table 'users' because I have a db implemented. I've read all the documentation of laravel about authentication and spent days reading a lot of posts with this problem, and I tried everything but still does not work. The problem is with the attempt method. My register method is working fine, but I can't login, actually I tried to put manually the data(that's why credentials are commented) to find the problem but I don't know why is not working
My Regsiter method.
public function storeUser(Request $request)
{
//dd($request);
$request->validate([
'name' => 'required|string|max:255',
'email' => 'required|string|email|max:255|unique:administradores,ADMIN_Correo',
'password' => 'required|string|min:8|confirmed',
'password_confirmation' => 'required',
]);
Administrador::create([
'ADMIN_Nombre' => $request->name,
'ADMIN_Correo' => $request->email,
'ADMIN_Contrasena' => Hash::make($request->password),
]);
//return redirect('home');
}
My Login method.
public function authenticate(Request $request)
{
/*$request->validate([
'ADMIN_Correo' => 'required|string|email',
'ADMIN_Contrasena' => 'required|string',
]);*/
//$credentials = $request->only('ADMIN_Correo', 'ADMIN_Contrasena');
if (Auth::guard('admin')->attempt(['ADMIN_Correo' => 'edwin2#gmail.com
','ADMIN_Contrasena' => '12345678'])) {
return redirect()->intended('home');
}else{
echo 'error';
}
//return redirect('login')->with('error', 'Oppes! You have entered invalid credentials');
}
My config/auth.php file
'guards' => [
'web' => [
'driver' => 'session',
'provider' => 'users',
],
'api' => [
'driver' => 'token',
'provider' => 'users',
'hash' => false,
],
'admin' => [
'driver' => 'session',
'provider' => 'admins',
]
],
'providers' => [
'users' => [
'driver' => 'eloquent',
'model' => App\Administrador::class,
],
'admins' => [
'driver' => 'eloquent',
'model' => App\Administrador::class,
],
],
My Model
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
class Administrador extends Authenticatable
{
use Notifiable;
protected $table = 'administradores';
protected $primaryKey = 'ADMIN_Id';
public $timestamps = false;
public $incrementing = true;
protected $fillable = ['ADMIN_Nombre','ADMIN_Correo','ADMIN_Contrasena'];
protected $guard = 'admin';
public function getAuthPassword()
{
return $this->ADMIN_Contrasena;
}
}
NOTES The field for password:(ADMIN_Contrasena) is varchar 255