Additional login form in Laravel 5.8

I have been learning Laravela for a few days.

I have second forms to login in domain.com/cms/login.

In my project I'm using original Laravel auth.

I have this route:

Route::get('cms/login', 'CMSController@loginAdmin')->name('loginAdmin');

and controller:

public function loginAdmin(Request $request)
    {
        if($user = Auth::user() && $request->user()->hasRole(['admin', 'admin1', 'admin2', 'admin3']))
        {
            return redirect()->route('indexAdmin');
        }
        else
        {
            return view('psCMS.modules.login.index');
        }
    }

and secondary login form (at domain.com/login I would like to log normal users - not administrators):

<div class="card-body">
                    <form method="POST" action="">
                        @csrf

                        <div class="form-group row">
                            <label for="email" class="col-md-4 col-form-label text-md-right"></label>

                            <div class="col-md-6">
                                <input id="email" type="email" class="form-control @error('email') is-invalid @enderror" name="email" value="" required autocomplete="email" autofocus>

                                @error('email')
                                    <span class="invalid-feedback" role="alert">
                                        <strong></strong>
                                    </span>
                                @enderror
                            </div>
                        </div>

                        <div class="form-group row">
                            <label for="password" class="col-md-4 col-form-label text-md-right"> </label>

                            <div class="col-md-6">
                                <input id="password" type="password" class="form-control @error('password') is-invalid @enderror" name="password" required autocomplete="current-password">

                                @error('password')
                                    <span class="invalid-feedback" role="alert">
                                        <strong></strong>
                                    </span>
                                @enderror
                            </div>
                        </div>

                        <div class="form-group row">
                            <div class="col-md-6 offset-md-4">
                                <div class="form-check">
                                    <input class="form-check-input" type="checkbox" name="remember" id="remember" >

                                    <label class="form-check-label" for="remember">
                                        
                                    </label>
                                </div>
                            </div>
                        </div>

                        <div class="form-group row mb-0">
                            <div class="col-md-8 offset-md-4">
                                <button type="submit" class="btn btn-primary">
                                    
                                </button>

                                @if (Route::has('password.request'))
                                    <a class="btn btn-link" href="">
                                        
                                    </a>
                                @endif
                            </div>
                        </div>
                    </form>
                </div>

LoginController:

public function authenticated(Request $request, $user)
    {
        $user->update([
            'last_login_at' => date('Y-m-d H:i:s'),
            'last_login_ip' => $request->getClientIp(),
            'id' => $request->user()->id
        ]);
        $userLoginHistory = new UserLoginHistory();
        $userLoginHistory->create([
            'date_time' => date('Y-m-d H:i:s'),
            'ip' => $request->getClientIp(),
            'user_id' => $request->user()->id
        ]);

        if($user = Auth::user() && $request->user()->hasRole(['admin', 'admin1', 'admin2', 'admin3']))
        {
            return redirect()->route('indexAdmin');
        }
        else
        {
            return redirect()->route('adminHome');
        }
    }

When I submit this form I have error:

The POST method is not supported for this route. Supported methods: GET, HEAD.

How can I fix this?

via Chebli Mohamed