App Invites with Facebook on iOS App

I'm trying to set up App Invites on an iOS app I developed. However, when I invite others to use the app, they do not get any notifications.

Right now, the App Link I obtained redirects me to a link starting with itunes.apple.com, but the screen is blank. In addition, when I run the didCompleteWith Results function, I get "didComplete = 1;". I am not sure why the invitation is not working and why the person on the other end is not getting a notification. I have a hunch it could have to do with my App Link, but I am honestly not sure at all. I am trying to use Facebook's purely Mobile API since I do not have a website for my app. Also, it is not released on the App Store.

Any and all help is greatly appreciated.

Thanks!