title: FB.AppRequest does not work
body: <p>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 </p>
  
  <pre><code>    FB.AppRequest(message, null, null, null, null, null, title,
          (result) =&gt; {
              Debug.Log(result.RawResult);
          }
      );
  </code></pre>
  
  <p>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.</p>
  
  <pre><code>{"to":"10XXXXXXXXXXXXXX33","request":"161XXXXXXXXXXXXXX89","callback_id":"4"}
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/HoLkW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HoLkW.png" alt="enter image description here"></a> </p>