Agents use ASSC keys to communicate securely with the server.
You can make any ASSC key pair the main, which is the key pair currently assigned to all deployed agents. Existing agents that use other keys in the Agent-server secure communication keys list do not change to the new main key unless there is a client agent key updater task scheduled and run.
Caution
Make sure to wait until all agents have updated to the new main before deleting older keys.