I’ve just been hit with the “no subscription found” error message, but when I’m prompted to renew, it says I’m currently subscribed. I know this has been an issue on Android in the past, but I’m on a 4th gen iPad Pro running iOS 13.4.1. Hopefully this can be resolved soon!
Have you tried signing out and signing back in?
It looks like a full app reinstall solved it, this can be closed now.