Keep getting pop-up to sign into iMessages and Facetime
This is happening on two of my computers (Apple Mini 2024 and Apple MacBook Pro 2019), both of which are running Sequoia. I am signed into icloud on both computers, but am continually getting the pop-ups "Sign in to iMessage with your Apple Account" and "Sign in to FaceTime with your Apple Account." Even when I sign in I get the pop-up again, within a minute. I've tried restarting the computers, signing out of icloud on the computers, restarting, signing in again, but nothing works. What can I do?
Mac mini, macOS 15.5