Update Apple ID Settings
All it says is that if i don’t log in again “some account services will not be available until you sign in again” but it won’t let me sign in and gives me this pop up
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What happens if you tap "continue"?
iCloud security overview - https://support.apple.com/HT202303
"End-to-end encryption
End-to-end encryption provides the highest level of data security. On each of your devices, the data that you store in iCloud and that's associated with your Apple ID is protected with a key derived from information unique to that device, combined with your device passcode which only you know. No one else, not even Apple, can access end-to-end encrypted information."
Related discussion by Apple Community Specialist --> https://discussions.apple.com/thread/252241993