I am getting the same thing ...
2023/06/30 10:40:50.430319 [TVE] Auth failed for Comcast_SSO: authn: 401 : Data not found
I am getting the same thing ...
2023/06/30 10:40:50.430319 [TVE] Auth failed for Comcast_SSO: authn: 401 : Data not found
Somethin must be messed up with their auth servers.
Trying here https://www.nbc.com/live from a browser, I pick Xfinity, get a green checkmark and it goes back to pick a provider.
same here, lost all Xfinity channels.
Has to be Xfinity. I'm getting errors on two different Channels servers with Reelz and Sundance.
2023/06/30 12:00:00.007987 [DVR] Starting job 1688151600-ch6085 Canary SUNDANCE Recording on ch=[6085]
2023/06/30 12:00:03.928522 [ERR] Failed to start stream on channel 6085 via TVE-Comcast_SSO: TVE: notAuthorized
2023/06/30 12:00:03.928622 [DVR] Error running job 1688151600-ch6085 Canary SUNDANCE Recording: could not start stream on channels=[6085]: TVE: notAuthorized
2023/06/30 12:40:00.001058 [DVR] Starting job 1688154000-ch6095 Canary REELZ Recording on ch=[6095]
2023/06/30 12:40:00.725291 [ERR] Failed to start stream on channel 6095 via TVE-Comcast_SSO: TVE: notAuthorized
2023/06/30 12:40:00.725406 [DVR] Error running job 1688154000-ch6095 Canary REELZ Recording: could not start stream on channels=[6095]: TVE: notAuthorized
2023/06/30 13:00:00.002533 [DVR] Starting job 1688155200-ch6085 Canary SUNDANCE Recording on ch=[6085]
2023/06/30 13:00:01.773848 [ERR] Failed to start stream on channel 6085 via TVE-Comcast_SSO: TVE: notAuthorized
2023/06/30 13:00:01.773909 [DVR] Error running job 1688155200-ch6085 Canary SUNDANCE Recording: could not start stream on channels=[6085]: TVE: notAuthorized
2023/06/30 13:40:00.000586 [DVR] Starting job 1688157600-ch6095 Canary REELZ Recording on ch=[6095]
2023/06/30 13:40:00.659667 [ERR] Failed to start stream on channel 6095 via TVE-Comcast_SSO: TVE: notAuthorized
2023/06/30 13:40:00.659725 [DVR] Error running job 1688157600-ch6095 Canary REELZ Recording: could not start stream on channels=[6095]: TVE: notAuthorized
But Magnolia works
2023/06/30 12:20:00.003018 [DVR] Starting job 1688152800-ch6108 Canary DIY Recording on ch=[6108]
2023/06/30 12:20:01.665819 [TVE] stream timestamps: diy: start_at=2023-06-30T12:19:01-07:00 end_at=2023-06-30T12:19:30-07:00 live_delay=27.368791545s
2023/06/30 12:20:01.666240 [TNR] Opened connection to TVE-Comcast_SSO for ch6108 DIY
2023/06/30 12:20:01.666742 [DVR] Recording for job 1688152800-ch6108 from TVE-Comcast_SSO ch6108 into "TV/Canary DIY Recording/Canary DIY Recording 2023-06-30-1220.mpg" for 9m59.996726026s
2023/06/30 13:20:00.001934 [DVR] Starting job 1688156400-ch6108 Canary DIY Recording on ch=[6108]
2023/06/30 13:20:01.635138 [TVE] stream timestamps: diy: start_at=2023-06-30T13:19:01-07:00 end_at=2023-06-30T13:19:30-07:00 live_delay=27.275131219s
2023/06/30 13:20:01.635333 [TNR] Opened connection to TVE-Comcast_SSO for ch6108 DIY
2023/06/30 13:20:01.635655 [DVR] Recording for job 1688156400-ch6108 from TVE-Comcast_SSO ch6108 into "TV/Canary DIY Recording/Canary DIY Recording 2023-06-30-1320.mpg" for 9m59.997922777s
Ditto - about 1/2 the stations now say this, but the other half is fine
authn: 401 : Data not found -
Checking at a couple other websites.
CNN works
ESPN works
TNT works
ABC local feed not working
BBCA not working
CBS local feed not working
CBS Sports Network not working
CSPAN not working
Disney not working
FXM not working
FYI not working
Hallmark not working
History not working
NatGeo not working
Paramount says Xfinity said not authorized
Science channel says 
TVLAND says Xfinity said not authorized
If it's not working on the network websites, it won't work in Channels DVR.
Damn. Same here. And just has to go out the weekend of the new season of Dr. Pol on Nat Geo Wild. And when most people gonna be visiting and want to watch tv...
Same here. Just tried again and got "no login form found".
Try to log into NBC sports and get the green checkmark and back to provider login.
Sad thing is it's like dealing with tivo, takes forever to get someone at xfinity who actually knows something about TVE.
Its a Holiday Weekend, and a long one for many, since the 4th is a Tues.
So Wed the 5th is when most folks get back to work.
So...I don't expect this to be fixed anytime soon.
WHo knows if it a Channels thing they need to fix, or a Xfinity side thing....
Xfinity auth
Logged in fine for me on NBC website, but would not stream NBC, cause my ad block makes it error.
Their stream app works fine still, but i know that is unrelated to TVE auth.
Today is the day Comcast removed Peacock Premium form their included with services, perhaps is related or just coincidence.
What happens when you try to authenticate here?
https://www.nationalgeographic.com/tv/watch-live/natgeo-wild
IF xfinity/comcast wants to move fully to streaming , they have to get thier act together. ALL friggin' day and its still dowm? Just imagine (years ago) if a major channel went off the air for a whole day? heads would roll at headquarters.....
iS THIS ISSUE WITH JUST XFINITY/COMCAST ?
I keep getting kicked back to this

TBS works when I select Xfinity
It seems to be only certain channels....
You can get the links to the different network sites here
https://getchannels.com/docs/channels-dvr-server/tv-everywhere/availability/#Comcast_SSO
Goes right to a page that says Content not available. Same image as other posted below i see.
But i can log into Xfinity site and access streaming and the show (live Nat Geo Wild) fine that way, just not via the networks site it seems. Different auth systems i guess. (Even though the login pages i get look identical when u first load it)
Ha! Why would a Cable company ever want to move to Streaming only? They are a monopoly. They have streaming offerings, and their cable boxes/ Internet gateways basicly act as Streaming Boxes these days. They have some mini stream box device u can get "free" if you have cable service with them, but they still force you to have the coax and pay all the fees associated with them. In my state, Cocmast/Xfinity is fighting a new law that would require them to fully disclose, any and all fees, right on their website, also affects cell phone providers.