- Update to the latest pre-release version of Channels DVR.
- Run Support > Troubleshooting from the Channels DVR web admin UI.
- Select Update Password for your Xfinity TVE source and enter your current password.
Then rescan your channel or channels in error.
Best to use a Xfinity viewer only role account for Channels DVR TVE
https://community.getchannels.com/t/tve-troubleshooting-tips/30965