RTFM TMS Provisioning guide:
" If the user is being imported from Active Directory, only Password, User ID and Image URL are editable."
Without AD you can edit all user configuration.
P.S. "a user ID will be automatically generated by TMS when the user is saved. Tandberg recommends
allowing TMS to generate these IDs, as they should be unique to each user."
Do you change TMS user/admin accaunts?
Br. Oleksandr