If that's the case you might want to call and ask. Each cable card is the same as a converter box in the system. S3 units will need two cards regardless which type they give you. CP Not Authorized is as you say not authorized meaning they haven't set the cards up in the system correctly. I'd call tech support and speak with a supervisor about the problem. If you still haven't made any progress I'd take it to the next step. You have two ways to file a complaint: First, file a complaint with your city. Each city has a liaison that deals with the Cable company. Sadly this is sometimes the only way to get the attention needed in some situations. Second, file a complaint with the FCC. The FCC's consumer site has submission page for this purpose. You'll need to provide them with as much detail as possible. Of course before you do all of this I'd wait to hear from TiVo. There is still a chance the unit is defective, although given my experience with Charter I doubt it. best of luck.