Create a new ID (if necessary)on another Apple device/computer and sign into iCloud using the same Apple ID on another Apple device/computer. You should then be able to sign in.
If you see a Could Not Create Apple ID or Could Not Set Up iCloud message. *
The maximum number of free accounts have been activated -
Or contact Apple ID Support. See the Apple Support articles below for contact information.
Apple ID - Official Apple Support. -
Contact Apple for help with Apple ID account security - Apple Support. * (Link doesn’t always load)
Get Support - Work through the screens to get a chat option. You may have to pick a slightly different problem.
Apple Support schedule phone call. -