User Profile

I have my app that has a subscription group with three auto-renewing in-app subscriptions. I have currently 70 subscribers since we released few months ago, and has a 70% retention. Recently about 4 users reported that after they subscribed the app does not give access to the information subscribed. They are subscribed because if they try to re-subscribe the App Store tells them so. I have had them delete the app re-install and press Restore Purchases and still nothing happens.To one of the users I sent him a Beta version thru TestFlight just to change environments and the the user is still experiencing the same thing.I reviewed again the logic of the code to find any clues as to what is happening and I fully tested it all over again and all is working fine. Since I do not have access to the TestFlight log, there is no way to see what is happening. I have no clue as to how to continue investigateing this issue. Any ideas?Thank you.