Hi Alex,
Thank you for your message.
It's important not to confuse address book sync with authentication on Hosts, as they serve two different purposes. Address book sync simply allows users to share 'shortcuts' to remote computers with certain properties. However, to actually access those computers, users still need to authenticate on them.
A good analogy is an address book of houses in a neighborhood. You can share the address book with people, but they still need the house key to enter any specific home.
If you're looking to revoke access when an employee leaves the company, you'll need to update the authentication settings on the relevant Hosts. The only authentication method that allows for centralized permission management is 'custom server security.' In
this setup, you enable the authentication role on the RU Server, create users and groups, and set permissions. When an employee leaves, you can simply remove them from the group or delete their user account.
To sum it up: use address book sync to share address book records, and use 'custom server security' to set and manage authentication permissions centrally.
Hope that helps!