AOuth login User data is stored but no login-ed. with HWIAOuthBundle and Custom UserProvider

I am using HWIAOuthBundle and Custom UserProvider on Symfony 4.4

in MyUserProvider

It stored the access_token and create new user. It works successfully.

namespace App\Security;

use HWI\Bundle\OAuthBundle\OAuth\Response\UserResponseInterface;
use HWI\Bundle\OAuthBundle\Security\Core\User\OAuthAwareUserProviderInterface;
use HWI\Bundle\OAuthBundle\Security\Core\User\EntityUserProvider;
use Doctrine\ORM\EntityManagerInterface;


class MyUserProvider extends EntityUserProvider implements OAuthAwareUserProviderInterface 
{

   private $entityManager;


   /**
   * {@inheritdoc}
   */
   public function loadUserByOAuthUserResponse(UserResponseInterface $response)
   {

      $username = $response->getUsername();
      $email = $response->getEmail();
      $user = $this->em
         ->getRepository(\App\Entity\User::class)
         ->findOneByEmail($response->getEmail());
  //when the user is registrating
      if (null === $user) {
         $service = $response->getResourceOwner()->getName();
         $setter = 'set'.ucfirst($service);
         $setter_id = $setter.'Id';
         $setter_token = $setter.'AccessToken';
      // create new user here
         $user = new \App\Entity\User();
         $user->$setter_id($username);
         $user->$setter_token($response->getAccessToken());
         //I have set all requested data with the user's username
         //modify here with relevant data
      //   $user->setUsername($username);
         $user->setEmail($email);
         $user->setPassword($username);
         $user->setEnabled(true);
         $this->em->persist($user);
         $this->em->flush();
         //$this->userManager->updateUser($user);
         return $user;
      }

    //if user exists - go with the HWIOAuth way
      $user = parent::loadUserByOAuthUserResponse($response);

      $serviceName = $response->getResourceOwner()->getName();
      $setter = 'set' . ucfirst($serviceName) . 'AccessToken';

   //update access token
      $user->$setter($response->getAccessToken());

      return $user;
   }

}

However even the user is created correctly in Database, but not login-ed

$this->getUser(); in Controller returns null.

So, I am confused that where the user login accomplished???

my setting is below

security:
    firewalls:
        main:
            oauth:
                resource_owners:
                    facebook:            "/login/check-facebook"
                    google:              "/login/check-google"
                    twitter:             "/login/check-twitter"
                login_path:        /login
                use_forward:       false
     #          failure_path:      /login
                oauth_user_provider:
                    service: my.user.provider

services.yml

my.user.provider:
    class:        App\Security\MyUserProvider
    arguments: ['@doctrine', App\Entity\User , { facebook: facebook_id, twitter: twitter_id, google: google_id }]


hwi_oauth:
    resource_owners:
        facebook:
            type:           facebook
            client_id:      '%env(FB_ID)%'
            client_secret:  '%env(FB_SECRET)%'
            scope:          "email user_posts"
        google:
            type:                google
            client_id:           <client_id>
            client_secret:       <client_secret>
            scope:               "email profile"
        twitter:
            type:                twitter
            client_id:           XXXXXXX
            client_secret:       XXXXXX
            scope:               "email profile"