When I was new at XJ and not in CASS but had my crew badge I was attempting to get back to MSP on Airways. I wasn't in uniform and know the blue smurfs sometimes won't let you through security without uniform or gate pass so I went to ticket counter to get a pass. The lady tried looking me up and CASS and wasn't able to find me. Because the company hadn't put me in yet. So she said I wouldn't be able to jumpseat. I tried telling her that CASS was only for Cockpit Access and my crew badge and a recip agreement were all I needed for a seat in the back. She didn't care and said no. I talked to her supervisor who said the same thing, he then radioed another supervisor and asked her and she said the same thing: "if your not coming up in CASS you don't get on the plane, period." I should also mention that I knew the Captain of this flight and he told me a couple days before that all I needed was my badge and I could have a seat in the back. So after not getting anywhere with the ticket agent I decided to try my luck getting through security. Well it worked and I got to the gate and checked in. She tried looking me up in CASS and once again said she wasn't able to find me and then went on to say, "well that doesn't matter anyways because there are seats in the back." How can one group of people be so clueless and another group know what they are doing at the same airport and the same company.