Thanks for the response. The chat support was completely useless. He wanted to reboot my internet modem to fix a cable TV problem.
This is a Tivo Roamio with a Cox cable card. It has worked fine until today. I do not use a tuning adapter. Never needed. Have hard reset the Tivo and re-seated the cable card. Guides work fine but channels are not authorized when selected.
Cox here has not mentioned discontinuing cable card support.
Spent an hour on the phone with a "cablecard specialist". Also fairly clueless.
They want to dispatch a tech who will not have a new cable card.
This could be the final push to just go all streaming.