REST API auth properties missing?

Hi,

I'm trying to use the REST API to query some information from the teamcity server during a build.  The REST API documentation suggests that there should be two properties( teamcity.auth.userId/teamcity.auth.password) that I can use to authenticate the api during a build.  But, these properties do not appear to show up on my isntance of Teamcity.  Do I have to enable them?  We do have LDAP authentication enabled, would that be disabling them?