IPhone : Facebook App Invites iOS SDK v4.0 configuration and states

I have recently started to implement the new Facebook's App Invites feature. The invite is sent, but my friends (or app testers in my case) whom I sent app invites to did not received any notification.

Having followed the tutorial, but I don't know if anything is misconfigured or how to debug the process.

So my questions are:

1. 
   

   Does app invites feature needs an actual App Store app ID to be configured in the App Link meta header tag? Because, as far as I understand this feature, the main purpose of this is to recommend my friends to try out an app that I like. The app I working on is still under development, and I see that the App Store ID field on App Link generator tool is optional. So I think when I shared an development app to my friends, they wouldn't receive the messages.

   
   


2. 
   

   In the callback of of current FBSDKAppInviteDialogDelegate delegate methods, specifically appInviteDialog:didCompleteWithResults:, what kind of Invite Sent success result should I received when the invite is actually sent? Because, currently as I tested, when the invite is sent from Facebook's app invites dialog, if I press Send and if the sending process success, the above delegate will only return boolean value of 1 for didComplete key. Not sure if didComplete is that the invite was sent to the receiver, or does it meant didFinished?

   
   

Side note related to (2.): In recent App Invite introduction video at F8, at 18:47, there was an indicator with an letter with "Invite Sent!" text below. When I tested out, I didn't see that.

Any inputs would be greatly appreciated, thanks!