title: Facebook Realtime Updates
body: <p>I am unable to add "notifications" to the "Realtime Update Subscriptions" of my app in Facebook. In the "Realtime Updates API" page of the Apps Settings in developers.facebook.com, I have the following settings:</p>
  
  <pre><code>Object: user
  Fields: notifications
  Callback: http://myserver/callback
  Verify token: my_token
  </code></pre>
  
  <p>if the Fields is set to "feed", it works, but if I attempt to save with Fields set to "notifications", it failed with the following error:</p>
  
  <p>Error
  Couldn't save 'user': Application cannot subscribe to notifications</p>
  
  <p>Is there anything I need to configure? I have tried adding all "Permissions" under "Permissions" page.</p>
  
  <p>Any input will be highly appreciated! Thanks in advance!</p>