Credentials method failing on laravel - database

Question

I am trying to make a switcher in my website (made in laravel), i have solved a lot of problems and at now, i am getting error at the function
protected function credentials(Request $request)
{
return $request->only('email');
}
My paths are like: localhost/es/password/email
I attach the code, thank you.
email.blade.php
#extends('layouts.app')
#section('content')
<div class="container">
<div class="row justify-content-center">
<div class="col-md-8">
<div class="card">
<div class="card-header">{{ __('Reset Password') }}</div>
<div class="card-body">
#if (session('status'))
<div class="alert alert-success" role="alert">
{{ session('status') }}
</div>
#endif
<form method="POST" action="{{ route( 'password.email', app()->getLocale()) }}">
#csrf
<div class="form-group row">
<label for="email" class="col-md-4 col-form-label text-md-right">{{ __('E-Mail Address') }}</label>
<div class="col-md-6">
<input id="email" type="email" class="form-control #error('email') is-invalid #enderror" name="email" value="{{ old('email') }}" required autocomplete="email" autofocus>
#error('email')
<span class="invalid-feedback" role="alert">
<strong>{{ $message }}</strong>
</span>
#enderror
</div>
</div>
<div class="form-group row mb-0">
<div class="col-md-6 offset-md-4">
<button type="submit" class="btn btn-primary">
{{ __('Send Password Reset Link') }}
</button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
#endsection
web.php
Route::redirect('/', '/en');
Route::group(['prefix' => '{language}',
'where' => ['language' => '[a-zA-Z]{2}']],
function(){
Route::get('/', 'HomeController#index')->name('home');
Route::get('/home', 'HomeController#index')->name('home');
Auth::routes(['verify' => true]);
Route::get('/projects', 'projectsController#create')->name('projects');
Route::post('/createProject', 'projectsController#store');
Route::post('/modifyProject/{id}', 'projectsController#update');
Route::get('/projects/{id}/delete', 'projectsController#destroy');
Auth::routes();
Route::get('/logout', '\App\Http\Controllers\Auth\LoginController#logout');
});
If you need something more of my app, say to this post and i will paste into in.
Regards

Answer 1

I have seemed that if i change the credentials functions to:
protected function credentials(Request $request)
{
//dd($request);
return $request->only('email', '#defaultLocale');
}
the response of
$response = $this->broker()->sendResetLink(
$this->credentials($request)
);
is passwords.throttle, and should be passwords.sent