High Sierra (10.13.6):
Could Not Sign in To iCloud
Your Apple ID "..." could not be used to sign in to iCloud. (34608)
Used the correct password; what does this mean?
Apple has had trouble with iCloud off & on today, see if that's it...
Apple - Support - System Status
OK.
Are you running any VPN, Anti-Virus, or Cleaning apps?
Have you restarted?
Don’t think that’s the problem; I can login to iCloud from another computer and account.
No, no, no, and yes.
I think the problem is with a particular iCloud account, as I have the problem with the same account on two different computers; no problem with another account.
Can’t login to iCloud
