Event Invitations Not Working in Graph or Rest API

Question

I'm not able to send event invitations from either the Graph or REST API. I initially was trying to do it through the Graph API, but after seeing the following question I decided to try the REST API.

How to invite a users friends to an event? Facebook Graph API

When I attempt to use the Graph API from the PHP SDK as such..

$facebook->api('/' . $event_id . '/invited/?users=' . $friend_ids_string, 'POST');

where $friend_ids_string is a string of user ids "user_id1,user_id2,user_id3" I receive the following error: "Fatal error: Uncaught OAuthException: (#200) Permissions error"

When I use the REST API called through the Graph API:

$facebook->api(array(
  'method' => 'events.invite',
  'eid' => $event_id,
  'uids' => $friend_ids,
));

I receive basically the same error: "Fatal error: Uncaught Exception: 200: Permissions error".

I have verified that my application has all of the necessary permissions set (create_event, rsvp_event,user_events,friends_events), and I'm only trying to add invitees to an event that was created by my app.

Does anyone know what could be causing this or a good work around?

Answer 1

This is only a partial answer.

I noticed that whenever one of the users that you are trying to invite are already invited then the entire POST fails with a #200 error. So you need to check the users in your coma delimited string against the users already invited to the event.

However even if I do that it still fails sometimes.

So I am not sure what the complete answer is.

Maybe there's a limit to how many you can post at once. Maybe one of the users that you are trying to invite has blocked your user in the past - I wonder how we could check this.