An agent or a supervisor cannot add or remove a skill if:
A direct agent call is in a queue for the skill.
A move is pending from Call Management System (CMS) or Communication Manager.
The agent does not log in to the system.
The agent is on an ACD call or in the After Call Work (ACW) mode for the skill.
The agent login ID does not have a Class of Restriction (COR) number that permits change of skills.
The skill number is invalid. For example, the skill number is Auto-Available Split or Skill (AAS) and the agent login ID is non-AAS.
The supervisor does not have a COR number that permits change of skills and a Class of Service (COS) number with console permissions.
The Tenant Number (TN) of the skill does not match the TN of the agent login ID.