I've also tried "domain=default" and excluding the domain.
When I run ldapsearch from my own computer or from a server, it returns these attributes just fine. I checked ldap.conf and I also checked the Splunk Supporting Add-on for Active Directory (SA-ldapsearch) config test connection and it all seems to work OK. I read up on the Global Catalog, but I'm not familiar Active Directory.
I've done a lot of searches on Google and this website but I can't seem to find any information that's getting me on the right path to a solution. Would any of you please give me some advice?