After six months of inactivity, Control Center automatically deactivates a user's account. (After an additional six months of inactivity, Control Center deletes the user account.) As a Control Center system administrator, you can reactivate users so they're able to log in again. You can also deactivate users if they no longer need Control Center access. Deactivating them keeps them in the system in case you need to activate them again.
To deactivate or reactivate a user: