How to create a shared Roundcube address book
In the Server app, create a new user (or several) such as:
shared-contacts marketing-contacts
In Roundcube, go to Settings/Preferences/CardDav

If you are not using SSL, setup like this

If you are using SSL, setup like this
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In either case, the short URL you entered will be replaced by the complete carddav URL, which might look like this.

Has this changed with the latest version?
I have tried the following URL which works with other CardDav Clients:
https://server.mydomain.com:8443/addressbooks/users/user_id/
Thanks!