I'm still having users emailing me to tell me they can't pick up their subscriptions. I'm not seeing the issue on my test devices (iOS 9.x, 12.x, 14.1) - but I have users who are on 13.x & 14.x who say the app no longer recognizes their subs.
I've also been having so much trouble testing with sandbox that I've given up. Up until yesterday it was the double login dialog, then fail & now it's taking forever to respond (if at all). There was a window yesterday when it all seemed to be working ok, but today it's barely working at all.