Access to Colorado Rockies channel 1262

For the first few days of the 2024 season, I was able to watch the Rockies games in the Xfinity Stream app on channel 1262. But after those first days, that channel has now disappeared from the app. Perhaps my plan does not entitle me to that channel, but I can't tell because when I try to view my channel list on the Xfinity customer site I get the HTTP error "400 Bad Request - Request Header Or Cookie Too Large". So that's my first question: Why did I lose channel 1262 from the Xfinity Stream app?

My second question is: If I am entitled to channel 1262, how do I get it on my TV? I watch Xfinity channels through a Cablecard in a TiVo box. Even last week when I was briefly receiving channel 1262 in the Stream app, I was not seeing that channel in my TiVo.

(A third minor question is, why can I not view my channel list in the Xfinity web site? Normally, I don't complain when someone offers me a large cookie, but not in this case.)