Error when POSTing a form to auth route (MethodNotAllowedHttpException)

I am trying to POST a form BEFORE user authentication. User inputs data into a form and POST it to the route protected by auth:

Route::group(['middleware'=>'auth'], function(){ Route::post('v2/payment/start/','PaymentController@generic');

});

If a user IS authenticated BEFORE the POST, the request is processed OK. If a user is NOT authenticated, user gets the login form, enters login password and receives the error "MethodNotAllowedHttpException".

What could be the cause of this? In my LoginController I have:

return redirect()->intended($this->redirectPath());

so, the user should be redirected OK.

Where could be the error?

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