Laravel API token only accepts one session

I am using angular for front end and for backend I am using laravel. For API I used the official documents for api token : https://laravel.com/docs/6.x/api-authentication. My current version is laravel 8 but this also works.

My problem is: this token only support single session, if I logged in with same credentials on another device or browser the old one is logged out. Please help me where am I doing wrong.

config/auth.php

    'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'users',
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'users',
            'hash' => true,
        ],
    ],

api/LoginController

$token = \Illuminate\Support\Str::random(60);

        $request->user()->forceFill([
            'api_token' => hash('sha256', $token),
        ])->save();

in all other controller

   public function __construct()
    {
       $this->middleware('auth:api');
     }