Teamworks LDAP Authentication to AD on Windows Server 2008 R2 Quirk?

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I just ran into the following error when pointing an existing known good Teamworks 6.2.2 instance from a Windows Server 2003R2 PDC to a Windows Server 2008R2 PDC for domain authentication:
LDAP: error code 49 - 80090308

did some googling and found out that sometimes windows AD requires you to use windows style bind credentials in the format "username@mydomain.com" rather than the traditional ldap DN of the user "CN=username,DC=mydomain,DC=com". Annoying -.-