loginAction.php

<?php
...

public function loginAction() {
    if($this->authorizationChecker->isGranted('IS_AUTHENTICATED_FULLY')) {
        return $this->dashboardAction();
    }
    $lastEmail = $this->authentication->getLastUsername();
    $error = $this->authentication->getLastAuthenticationError();
    
    return $this->templating->renderResponse(':users:login.html.twig', ['lastEmail' => $lastEmail, 'error' => $error]);
}