attempt with guard is always returning false laravel 5.2

I am trying to make a guard in laravel 5.2, but when I make the attempt it doesn't work it always return false, even if a don't Hash the password.

This is my guards config/auth.php

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

    'admin' => [
            'driver' => 'session',
            'provider' => 'admin',
        ],

    'api' => [
        'driver' => 'token',
        'provider' => 'users',
    ],
],

providers config/auth.php

    'providers' => [
    'admin' => [
        'driver' => 'eloquent',
        'model' => App\Administrator::class,
    ],

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

My model

use Illuminate\Foundation\Auth\User as Authenticatable;
class Administrator extends Authenticatable
{
    protected $table = 'administratorsTable';
    protected $primaryKey = 'admID';

    protected $fillable = [
        'admEmail', 'admName', 'password',
    ];

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

    public function setPasswordAttribute($valor){      
        if(!empty($valor)){
            $this->attributes['password'] = \Hash::make($valor);      
        }  
     }
}

This is my controller, if I change the "admin" to he default guard "web" it acctually works fine!, (Changing also the fileds' names). I cant understand why it doesn't return true.

    if (Auth::guard('admin')->attempt([
        'admEmail' => $request['email'],
        'password' => $request['password']
        ])) {
        return "Welcome";
    }else{
        return "Fuuuuuuuuuck";
    }

I have also tried to use the login fucion with:

use AuthenticatesUsers;
public function loginUsername()
{
    return property_exists($this, 'username') ? $this->username : 'admEmail';
}


protected $guard = 'admin';

public function authenticated()
{
    return "Welcome";
}

And if I change again the fields for the "web"guard it works fine.

via Saucyloco