title: Facebook iOS SDK 4.0 "App Invites" sent without iOS notification
body: <p>I am currently using the Facebook iOS SDK 4.0. In examples they show that when a user sends an app invite, the receiver gets a notification from the FB app. That's not happening with me. A notification appears in the app when it's sent but ouside of the app, nothing. Here is my code:</p>
  
  <pre><code>- (IBAction)inviteFriends:(id)sender {
  
      FBSDKAppInviteContent *content =[[FBSDKAppInviteContent alloc] initWithAppLinkURL:[NSURL URLWithString:@"https://fb.me/413510792107174"]];
      [FBSDKAppInviteDialog showWithContent:content delegate:self];
  
  }
  </code></pre>
  
  <p>Because there is a notification in the app, it leads me to believe that the code is correct it's just a matter of configuration. Specifically, this is what I'm trying to achieve: <a href="https://developers.facebook.com/docs/app-invites/overview">https://developers.facebook.com/docs/app-invites/overview</a>.</p>
  
  <p>I've also tested for the app NOT being installed with the same result. I'm curious if anyone else is having this problem. Thanks in advance.</p>