My customers are suddenly getting this message in production. Some have previously downloaded my app, others are new. The codes are two months old and still active for another month, and I generated new codes set to expire in Dec 2021 (4 months), yet the same message. Anyone figure this out?

In my case, it was a combination of bad timing and tax code changes. My codes expired after Sep 1, 2021 when new tax codes went into effect. First, I had to renew my Tax and Banking Agreements, then wait for Apple's ill-timed maintenance to complete for my changes to be accepted. Then, I had to update my banking information because for whatever reason it was cleared. However, the edit button was disabled, so I needed to modify the HTML (Dev tools) to first enable the button. Then I made my changes and submitted. Very stupid.