Is this fully resolved for you? I’ve had this happen every so often, usually I would reboot and it wouldn’t show back up. Sometimes it would though and I would forget about it and it would eventually seem to sort itself after a few days. I’m not sure if just waiting is what resolves it and its just some login token that refreshes or if manually updating apps resets something and fixes it for future updates of those apps. When it’s happening I noticed that TestFlight apps won’t update in the background when plugged in like usual. You can still manually install/update however. What I tried this time is signing out of the normal App Store, that also seems to sign you out of TestFlight. And when you re sign in to the App Store, TestFlight still asks you for authorization to sign in. I’ll post back if this method of re logging in to it resolves it.

@drmrbrewer did it resolve itself again after the reboot caused the message to pop back up? I just setup a new device and noticed that after a recent reboot that it started getting this message again in place of update notifications to TestFlight packages notifications (the other devices on the account got the package update notification instead). And if it did, did you notice background TestFlight updates (when plugged in) and TestFlight package notifications resume?