Problem authenticating to Active Directory LDAP server

[m1systems]

I have set up a LDAP authentication server for my Windows Domain Controller to use with my OpenVPN server. Since I'm able to enumerate a list of containers with the Select a container button in the settings I know I'm able to successfully communicate with the server. However when I go the authentication tester in diagnostics and try to authenticate a login I get an error that only says Authentication failed with no other information and I don't see anything in the logs. I've tried both username and username prefixed with the domain name like domain\username and neither works. I'm using a Netgate 1100 if that matters.