As the reviewed person, you can appoint people within the set limits.

If the person who validates nominations rejects them, the reviewee must assign new reviewers, but cannot reassign those who have been refused.

Once the manager has approved reviewers within the set limit, the person who is reviewed can no longer assign anyone.

If the “Manager can add a reviewer” setting has been enabled, the manager can appoint reviewers, including those he has declined.

An HR specialist may add participation to a 360° assessment with appointment, even if such participation is “pending approval by the manager” or has been declined.