In the last week the MacOS App Store has refused to update some free apps (Microsoft Remote Desktop, TickTick). I get a notification that the App Store's T&Cs have changed and I must agree with them to proceed. But when I do this, I get another message telling me that it isn't possible to reload the article because it was bought or refunded for another user. This is for free apps, so I've no idea what the message is trying to tell me.
Having, a few years ago, had all kinds of "fun" with various Apple IDs (probably the most broken SSO out there), I settled on one and have stuck with it. I suspect the best approach will be to delete and reinstall. Fortunately, I don't have a lot of associated data to lose. But, before I do this, I wonder if anyone else has come across this?