I called and tried to give my references, including TER , DC, and P411. However, the person on the phone said, unless I fill out their form, which asks for the real name and ssn, I cannot get an appointment.

This sucks! I bet MD police is forcing them to do this, or won't issue an escort license. what are they thinking?
I am not sure what good being this stringent and retaining so much personal info would do for anybody...
There have been many PROVEN cases, in which some people have used other people's info - SSN, email and cell phone number to book appointments with them.