Same thing happening here for the last 12 Fuad or so. Sent in detailed feedback and they requested more, so I did. I reverted one of my iPhone back to iOS 14 and my iPad, but no find my services working on any devices. If I go to icloud.com, everything shows working as fine. my device constantly want me to sign into icloud, even though they are already signed in. I swear it seems like something is corrupted in my Apple ID or something. Car wait to here some results back. Hopefully beta two this week.

You’re right! I’m fixed too!!!!!! Must have been a backend issue!!!