Base Roamio Won't Recognize Cable Card

Today, I am trying to set up the refurbished base Roamio that I purchased last week. I am upgrading from a TiVo HD. The problem I've run into is that the Roamio won't recognize the Scientific Atlanta cablecard that I've removed from the HD. In fact, it won't even recognize the Scientific Atlanta cablecard from my Premiere.

I understand that cablecards need to be paired with an individual TiVo. However, I'm not even able to get to that point of being able to pair the card with the TiVo. During Guided Setup, the TiVo says "No card."

I've called TiVo tech support and they blamed it on the Scientific Atlanta cable card being an old model. They said I should go to my cable company (Cox) and ask for a bunch of new cable cards and try them all. What I don't understand is how that could be the problem if my HD, Premiere, and Roamio Pro all are working fine with the Scientific Atlanta cards.

I'm trying to figure out if there is a trick to inserting the cable card in a base Roamio or whether I have a dud Roamio (I did buy a refurb, after all).

Any suggestions/thoughts?