MobileGestalt no access to InverseDeviceID

Question

This happens with every app when I try to use OpenGLES on my iPhone7+ with iOS10.3. But it works without any problems on my iPho

Answer 1

I just had this issue when trying to use in-app-purchases.

Not sure if yours is the same issue, but I realised that you HAVE to create a Sandbox User in iTunes Connect, then log into iCloud on an iOS device with that user to enable the app to work.