Full Apple Account sign-out/sign-in fixed bidirectional Contacts syncing on my Mac mini. Contacts-only toggling, restarting, changing networks, and rebuilding AddressBook did not. My MacBook Air has the same symptoms, but signing out of all iCloud services would be highly disruptive. Is there a supported way to reset only the Contacts connection or its account authorization without signing out of the whole Apple Account?
[Re-Titled by Moderator]
Original Title: Is there a supported way to reset only the Contacts connection or its account authorization without signing out of the whole Apple Account?