Why does it redirect to home after pressing the login button, laravel + vue?

Question

Laravel

After I click the "Login" button on the site, I am redirected to the main page of the site, instead of further authorization through VK.

Button Skin:

<a v-if="$root.user === null" href="/auth/vkontakte" class="autorization-vk"><i class="fab fa-vk"></i></a>

Route code:

Route::group(['prefix' => '/auth'], function () {
    Route::post('/{provider}', '[email protected]');
    Route::get('/{provider}/callback', '[email protected]');
});

The authorization code is working, used by Socialite, taken from another job.

<?php

namespace App\Http\Controllers;

use Auth;
use App\User;
use Socialite;
use Illuminate\Http\Request;

class LoginController extends Controller
{

  public function login($provider)
  {
      return Socialite::driver($provider)->redirect();
  }

  public function callback($provider)
  {
      $user = json_decode(json_encode(Socialite::driver($provider)->user()));
      if (isset($user->returnUrl)) return redirect('/');
      $user = $user->user;
      $user = $this->createOrGetUser($user, $provider);
      Auth::login($user, true);
      return redirect()->intended('/');
  }

  public function createOrGetUser($user, $provider)
  {
    $existUser = User::where('network_id', $user->id)->first();

      if ($provider == 'vkontakte') {
          if ($existUser) {
              $username = $user->first_name . ' ' . $user->last_name;
              User::where('network_id', $user->id)->update([
              'name' => $username,
              'avatar' => $user->photo_200
            ]);
              $user = $existUser;
          } else {
              $username = $user->first_name .' ' .$user->last_name;
              $user = User::create([
                'network' => 'vkontakte',
                'network_id' => $user->id,
                'name' => $username,
                'avatar' => $user->photo_200,
                'ref_code' => $this->randw(5)
              ]);
          }
      }
      return $user;
  }
}

This is the first time I've encountered such a problem. I would be very grateful for your help!