FortiManager and LDAP (Limit to Group)

We are trying to get FortiManager and trying to get it to limit to a group however it doesn't work correctly. We tried to follow the one article we found for AD but we are unable to get it to work correctly.

config system admin ldap
    edit "IPA_1"
        set server "<ip>"
        set cnid "uid"
        set dn "dc=example,dc=com"
        set type regular
        set username "uid=ldapconnect,cn=users,cn=accounts,dc=example,dc=com"
        set password ENC <encrypted_password here>
        set group "cn=allowedgroup1,cn=groups,cn=accounts,dc=example,dc=com"
        set filter "&(objectCategory=user)(memberOf=cn=allowedgroup1,cn=groups,cn=accounts,dc=example,dc=com))"
        set secure starttls
            set adom "all_adoms" 
    next
end

Can anyone help me figure out what may be wrong with either my filter or group statement? This is against LDAP/389 Directory Server.