FB.AppRequest does not work

Question

I am trying to send App Requests with Facebook SDK on Unity. Everything is alright until I press 'send'. It also returns a success but nothing happens in my friends' facebook :S

    FB.AppRequest(message, null, null, null, null, null, title,
        (result) => {
            Debug.Log(result.RawResult);
        }
    );

As you can see, I am able to show the friends list and select the ones who will receive the request. After pressing send, it returns a success(I have put the Xs intentionally). However, nothing happens on my friend's facebook.

{"to":"10XXXXXXXXXXXXXX33","request":"161XXXXXXXXXXXXXX89","callback_id":"4"}

Answer 1

I have assigned my friend receiving the request as administrator so that he was able to get the notification. Otherwise, he does not get anything because the facebook app is currently in development mode.