title: Empty message body with graph API
body: <p>When I try to get the message body using graphapi I can't get it even if I extract the id and the number of unread messages I was thinking about permission, but I add the read_inbox permission and when trying the tools of developer the message was saying field is empty or disallowed by the access token, and I have this message saying </p>
  
  <pre><code>error": {
     "message": "You can only access the \"inbox\" connection for the current user.", 
     "type": "GraphMethodException", 
     "code": 100
  </code></pre>