The uccxworkforce user is an user in contact center and there is a know bug where you cannot see this user in UCCX 8.5.1. SU2 actually fixed this bug for me. If you look under password management in uccx you should see the workforce user and from there you can change the password.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...