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I setup an IAP for an autorenewing subscription, and got up and running on store kit using apple sandbox test accounts setup in itunes connect.I followed the documentation for developemnt: sign out of the app store on a test device, and then launch the app and go through the IAP flow using the sandbox account when prompted for an authentication. That worked just fine.At that point, I was ready to introduce our IAP flow in beta via test flight. Accoring to the TestFlight FAQ (pg 7), you can use a normal iTunes account under Beta and charges for IAP's are free within the context of the beta app.In our beta app the IAP flow completes successfully with a normal itunes account. The trouble is that after a period of time iOS starts prompting for account authnetication all the time, both in and out of the app. All of our users are seeing this behavior. It seems like the account status gets screwed up once your subscription expires in the beta version (30 min subs with 6 extensions).As far as I know, I am not able to affect this. The store kit API's basically allow me to initiate the process, and I get a callback from storekit with the status of the purchase attempt. I do not control asking for authentication or anything like that, so I'm at a bit of a loss as to what I might have done in my code to caused iOS to freak out and aggressively prompt for authentication.Has anyone else seen this behavior with in app purchases within TestFlight distributions? Any help / insight appreciated...thanksEnvironment:We are targeting iOS SDK 8.0, building against the 9.0 SDK.* iOS versions: 8.1.4, 9.0.0, 9.0.1, 9.0.2* Devices: iPhone5, iPad mini, iPhone 6/6s