Apple rightfully has a reputation of having its products "just work." And 99% of the time, that adage holds true. Until it doesn't. When things do go wrong, Apple's error messages are cryptic, at times offering no obvious clue as to how to remedy them. One such error is the "Authentication Error" message when trying to log into iMessage and FaceTime on your Mac, even if you've successfully logged into iCloud.
For a non-obvious reason, my previously properly running Mac could no longer log into iMessage or FaceTime despite being successfully logged into iCloud. Notes synced, Documents synced, Photos was working, etc.
Trying to log into iMessage triggers my two-factor authentication mechanism as expected. But when prompted for my iCloud username and password, and after a long timeout period, I simply get an "Authentication Error."
The potential fix
The fix involves getting Apple's servers to re-initialize your Mac hardware to be allowed to access your iCloud services.
Log out of iCloud on your Mac
- Open System Preferences.
Click Apple ID.
- Click Overview.
Click Sign Out…
Follow the instructions to keep or delete iCloud data like calendars, reminders, and photos from your Mac.
- Restart your Mac.
Log into your iCloud.com web account
- Navigate to iCloud.com in Safari.
Log in with your iCloud credentials.
- Click Account Settings.
Click your problematic Mac under My Devices.
- Click the X next to the Mac.
Sign back into iCloud on your Mac
- Open System Preferences.
Click Sign In.
- Sign in with your iCloud credentials.
Enter your Mac sign-in credentials.
Once you're signed back into iCloud on your Mac, you should be signed back into Messages and FaceTime automatically.
This is but one solution (of the myriad of suggestions found online) that worked for me. Let us know in the comments if this fix helped you too!
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