laravel 8 database connection error when resetting password for guard admin

i have a project for multi-users and one admin. my problem is when forget your password for guard admin. however the user web guard is work fine when i use forget your password. i use mailtrap as A host mail. in admin route looks like

// Password reset process
Route::get('/password/reset', 'AdminForgotPasswordController@showLinkRequestForm')->name('admin.passwordReset');
Route::post('/password/email', 'AdminForgotPasswordController@sendResetLinkEmail')->name('admin.passwordEmail');

Route::get('/password/reset/{token}', 'AdminResetPasswordController@showResetForm')->name('admin.passwordwithtoken');
Route::post('/password/reset', 'AdminResetPasswordController@reset')->name('admin.passwordupdate');

// Password confirmation process
Route::get('/password/confirm', 'AdminConfirmPasswordController@showConfirmForm')->name('password.confirm');
Route::post('/password/confirm', 'AdminConfirmPasswordController@confirm');

in config/auth.php

    'guards' => [
        'web' => [                  //  name of guards
            'driver' => 'session',
            'provider' => 'users',   // search in users table
        ],

        'admin' => [                  //  name of guards
            'driver' => 'session',
            'provider' => 'admins',   // search in admins table
        ],

        'api' => [
            'driver' => 'jwt',
            'provider' => 'users',
            'hash' => false,
        ],
    ],

    /*
    |--------------------------------------------------------------------------
    | User Providers
    |--------------------------------------------------------------------------
    |
    | All authentication drivers have a user provider. This defines how the
    | users are actually retrieved out of your database or other storage
    | mechanisms used by this application to persist your user's data.
    |
    | If you have multiple user tables or models you may configure multiple
    | sources which represent each model / table. These sources may then
    | be assigned to any extra authentication guards you have defined.
    |
    | Supported: "database", "eloquent"
    |
    */

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

        'admins' => [
            'driver' => 'eloquent',
            'model' => App\Models\Admin::class,
        ],

        // 'users' => [
        //     'driver' => 'database',
        //     'table' => 'users',
        // ],
    ],

    /*
    |--------------------------------------------------------------------------
    | Resetting Passwords
    |--------------------------------------------------------------------------
    |
    | You may specify multiple password reset configurations if you have more
    | than one user table or model in the application and you want to have
    | separate password reset settings based on the specific user types.
    |
    | The expire time is the number of minutes that the reset token should be
    | considered valid. This security feature keeps tokens short-lived so
    | they have less time to be guessed. You may change this as needed.
    |
    */

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

    /*
    |--------------------------------------------------------------------------
    | Password Confirmation Timeout
    |--------------------------------------------------------------------------
    |
    | Here you may define the amount of seconds before a password confirmation
    | times out and the user is prompted to re-enter their password via the
    | confirmation screen. By default, the timeout lasts for three hours.
    |
    */

    'password_timeout' => env('PASSWORD_TIMEOUT'), // use in middleware password.confirm

my Controller looks like (AdminResetPasswordController.php)

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Providers\RouteServiceProvider;
use Illuminate\Foundation\Auth\ResetsPasswords;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Password;

class AdminResetPasswordController extends Controller
{
    use ResetsPasswords;

    protected $redirectTo = RouteServiceProvider::ADMIN;

    public function showResetForm(Request $request, $token = null)
    {
        return view('admin.passwords.reset')->with(
            ['token' => $token, 'email' => $request->email]
        );
    }

    // public function reset(Request $request)
    // {
    //     $request->validate($this->rules(), $this->validationErrorMessages());

    //     // Here we will attempt to reset the user's password. If it is successful we
    //     // will update the password on an actual user model and persist it to the
    //     // database. Otherwise we will parse the error and return the response.
    //     $response = $this->broker()->reset(
    //         $this->credentials($request),
    //         function ($user, $password) {
    //             $this->resetPassword($user, $password);
    //         }
    //     );

    //     // If the password was successfully reset, we will redirect the user back to
    //     // the application's home authenticated view. If there is an error we can
    //     // redirect them back to where they came from with their error message.
    //     return $response == Password::PASSWORD_RESET
    //         ? $this->sendResetResponse($request, $response)
    //         : $this->sendResetFailedResponse($request, $response);
    // }

    protected function guard()
    {
        return Auth::guard('admin');
    }
    public function broker()
    {
        return Password::broker('admins');
    }
}

when i request to change password i get the email notification in mailtrap fine, when i click reset password button i go to the page to change my password , when i enter the new password and password confirm and hit enter i get message 509 database connection error connection error

as i said before the user guard web works fine. thank you