Social Plugin Laravel

Question

I am facing problem logging into facebook using social plugin from laravel platform suddenly. The users were able to use the plugin earlier but the facebook support/test team was having problems and now our application's facebook login is disabled by facebook.

The library in composer

"laravel/socialite": "^5.2"

and the config

'facebook' => [
        'client_id' => env('SOCIAL_LOGIN_FACEBOOK_CLIENT_ID'),
        'client_secret' => env('SOCIAL_LOGIN_FACEBOOK_CLIENT_SECRET'),
        'redirect' => env('APP_URL') . '/auth/social/authenticate/facebook',
    ],

After going through several SO links, I have updated the configurations on the app to add redirect urls (I have replaced the actual domain with test.org for this post)

After all this when I am trying to login to the facebook with a test user from the test website I get the error

App not setup
Switch to a registered test user

and when I am inside that test user's facebook, I see the error

Can't load URL
The domain of the URL isn't included in the app's domains

Am I missing out on declaring app domain somewhere?