The concerns are that most corporate implementations of network roles and permissions are not up to date or accurate, so CoPilot will show data to an employee that they should not be allowed to see. Salary info is an example.
Basically, CoPilot is following “the rules” (technical settings) but corporate IT teams have not kept the technical rules up to date with the business rules. So they need to pause CoPilot until they get their own rules straight.
Edit to add: if your employer has CoPilot turned on, maybe try asking for sensitive stuff and see what you get. ;-)