Please note Horde was removed in version 108. There is no equivalent shared address book feature after Horde is removed.
The cPanel accounts shared address book can only be utilized through Horde. You can retrieve the CardDAV URL in the Horde Webmail client.
- Log into the Horde webmail client for the e-mail address
- Hover over Address Books and select the Shared Address Book
- Click edit (the pencil icon) beside the shared address book.
- Copy the CardDAV Subscription URL for use in your CardDAV client