Dramonc
Then the system will not add authentication tokens. When CCs are on a Ticket and an Agent sends out a Reply we generate one email with the From being the User and the CCs added to the CC (like any email provider would). Since this is one email we cannot add auth tokens as then the CC could masquerade as the User which is not good. Since we don't send out individual emails we cannot selectively show auth tokens based on user.
There is no way to change this behavior unless you modify the code which I highly recommend you don't do in this case as it will be a huge security risk. But you do you.
Cheers.