The chromedata folder used to be an issue with Xfinity and Spectrum.
When you Update Password on your source, it clears the chromedata folder.
There were some recent changes for TVE authentication and I don't think keeping the chromedata folder around is as much an issues as it used to be.
I now only clear it as a last resort before removing and re-adding my Xfinity source.
If you login at nbc.com/live does Xfinity give you any popups after login?
Like reminders to verify secret questions, add an email or phone for recovery, etc.
If so, clear them, disconnect at nbc and try adding the source again.
I'm able to log in with the Primary account and viewer-only account at nbc.com/live without issues or popups. I think I'm just going to give it another day and try again.
After a scan do the logs show any lines with screenshot.png? If so you can view them in the dvr folder to get a better idea
I'll take a look but this is the error and screenshot showed after failing to add it as a source. Pretty generic and just the standard login screen.
Login to Xfinity with your primary account username and make sure Auto Authentication is off at https://idm.xfinity.com/myaccount/userprofile
If you use Xfinity for both TV & DVR, and are running Channels DVR at the Xfinity service address, then you should set Auto Authentication to ON. That way the DVR doesn't need to try to enter your user/password at all.
Add me to the TVE nightmare on Xfinity. Last few days/week I’m getting some channels but not all. I can manually login to the stream app and that works as well as the individual apps for espn and AMC but nothing I can do will get me to login in channels. Ugh.
I repeatedly get the cable authentication failed.
Did you try manually rescanning the channels in error one at a time?
Yeah I have tried. Same result. It’s so frustrating 
I'm gonna completely delete channels DVR and reinstall. If that works, I'm just gonna set up a VM and toggle back and forth when this happens.
I know there are backups but I’ve never had to use them is there a way to revert back to before I deleted Xfinity TVE as a source? The reason I ask is because there were still about half on my channels that were working.
Uninstalling and reinstalling didn't work. I noticed there were still some channelsdvr folders after uninstalling.
Do you recommend manually deleting everyhing?
Is there an OS that's better for xfinity users? I'll run anything in a VM if it prevents this issue.
Ok, nothing I tried worked so I was reading another post about DirectTV troubleshooting and came across this post recommending changing your password: Unable to add DirecTV as TV Everywhere Source? - #7 by Tom_Finney
Which made me think this might work for me as well (even though there were no pop-ups saying it was an issue). I tried it and I was able to add TVE as a source, getting me past the login error.
It may be worth adding this as a step in this forum as a suggestion.
I'll update once the scan is complete but changing the password at least got me back to my starting point.
Doing an Update Password in Channels DVR also clears the chromedata folder which could be what fixed it for you. It's a trick we Xfinity and Spectrum users have used since it was implemented in Channels DVR. Select Update Passoword and just enter your same old password to clear the chromedata folder.
Mentioned in the post you linked to
Yes, I tried the update password trick yesterday to no avail. Actually updating my password with Xfinity did solve the login errors so it may be worth mentioning in the post.
