I cannot find recent information regarding use of a Cable Card in a TiVo unit. The web site goes to a blank page. Does Xfinity offer a cable card? If so, what is the cost/fee? Are all equipment fees waived with the use of a Cable Card?
What is the web address of the blank page, and what is the web address of the page that links to it?
Do https://support.tivo.com/SupportPortalArticleViewPage?artURL=/articles/Installation_Setup_Configurat..., https://www.xfinity.com/support/articles/about-cablecards, and https://www.xfinity.com/search?q=CableCARD work for you?