Did it show up in the user preference pane at all? My guess is that it's a hidden account and the UID of the user account you tried to delete it with was an over 500 user.
Nope. It's a visible account. Both old and new accounts are 500+.
Was there an error displayed when you tried to delete it? Or did it look like it was going to work, but the account just remains after it finishes?
Is there anything else you can post about the account that might help us figure out what's going on? I can't see how an account created by a Jamf policy would be non deletable under a regular admin account.
So it appears that this was an Apple thing. the Issue was that the local account was the only non-hidden, local account on the workstation. Every other account was either an AD mobile account or hidden service account. If I created another local account I could go back and delete this one.
Casper Remote could delete the account since it performs the deletion with
sudo /usr/bin/dscl . -delete "/Users/XXXX"
and I could also delete via terminal with the same command. Apple confirmed that the GUI will not allow you to remove a local admin user if it is the only local admin user. It makes sense that this is the case, but from memory, this seems different that what you could do in the past.