It's not a Comcast/Xfinity issue.
It's the Channels DVR script trying to login and failing. Out of the 100+ channels in my TVE Comcast feed, 75% are working fine. There's about 10-20 networks that are exhibiting that error in the logs. This was working fine up until this morning on all channels. Something changed with a build OR something changed on the provider side that needs to be revisited on the channels side. I submitted a ticket with the complete logs that show how many channels from the very same Xfinity / Comcast account are successfully integrated into my channels DVR server.