Cannot delete user account Mojave 10.14.6
Logged in as Admin, I created a new user account to try to sort out multiple iCloud ids. I have the issue repaired and I want to remove the account. I go to System Preferences, Users&Groups, as Admin, and I can see the other user account. I've unlocked the lock that prevents changes. However, all the "Other Users" on the list are greyed out and cannot be selected to delete. Any ideas?
iMac 27″, macOS 10.14