There is an issue where you delete an domain/subdomain, then you unable to to add back and receive error as below:
Error from domain wrapper: domain is owned by another user.
(1) First, check if there is any entry on path as below, if yes, remove it
Shortcut, you can use command to grep it
grep “domain.com” *
(2) Check on the DNS if that is exist, remove it if it exist
(3) restart the Cpanel service and have a try now
Bingo, should be able to add now 🙂