I have setup Zimbra with authentication working through active directory. I am trying to setup the GAL to be integrated with Active Directory. I followed the steps in the admin and connected successfully but with no results. I am unsure of how to resolve this.

GAL setup:
zimbraGalLdapBindDn: user@example.com
zimbraGalLdapFilter: ad
zimbraGalLdapSearchBase: ou=User Accounts,dc=example,dc=com
zimbraGalLdapURL: ldap://server:389

Any help would be greatly appreciated. Thank you.