Xfinity On Demand broken after 20.6.1 update

Was working fine for months before this release, now getting CL-14 errors when trying to watch any show on XOD. All my other cablecard channels work great with no pixelation etc. and my cable modem signals are good so I don't think it's a signal level issue (which the error indicates might be the issue).

I think 20.6.1 broke something between Tivo and Comcast for XOD, at least on some Roamios. This started right after I got the update 2 days ago.