Managers and team leaders cannot be archived
The co-worker is still listed as a team leader or manager for another co-worker
You can only archive a co-worker once they are no longer listed as a team leader or manager.
First, remove this person from all teams in which they are listed as a team leader, and check the personnel data of other co-workers to see if the person is listed as a supervisor. Archiving will only be possible once they no longer hold these roles.
Take a look at our YouTube tutorial on this topic: Archiving team leaders/managers