I'm running a fresh install in Docker, I've verified that YTTV TVE attempts to use ABC.COM for the initial authorization. this DOES NOT WORK since Disney+ is no longer available in YTTV. I've contacted support and they verifies it, with no fix.
I suggested using NBC.COM or better yet, use ABC.COM as a default, but either failover to NBC.COM, or, use a variable for the value.
Please see if this pre-release is better.
Did you ever get it to work, and if so, care to share how? I’m in the same position.
Did you update your Channels DVR Chrome?
Have you updated your chrome and done the steps @chDVRuser has provided. Those steps will give you the best chance of success. I’m speaking from experience from having chrome 114. No issues after updating to ver 129
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More than half of the users I try to help never post back.
I just have to assume my advice helped them 
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I updated to pre-release 2025.12.09.2002. I then did the Dish sign in, holding Sign In. It updated Chrome to 129.0.6668.59.
I then tried to sign in using the youtube TV login that is linked to the gmail that has no 2FA or anything tied to it......and I got the same error. I also posted this in the other thread so its not liking that Im posting the same stuff again. It keeps blocking my post.
Replied in the other thread you posted in.
There are now 7 open threads about YTTV issues.
As they get fragmented it makes it harder to find the latest information.
I’ve never been able to add it as a source so it’s never been one.
You could try using the Channels DVR TVE docker image or using a different device for Channels DVR. No ideas other than that, what I put in the TVE Troubleshooting tips and what I've mentioned.
When you get TVE to log in keep it setup in channels and just disable it until you subscribe again.
I have an email i used to log in so i will simply setup my subscription using that email and invite the master addresss used by all my boxes and enjoy TVE or I will alwasy be a new customer and create another address and invite the TVE address and jthe address used for my boxes.
I'm liking DTV so may not bother love the free Hulu, disneyplus and hbo max plus log ins to the different network apps.
I’d like that option but I have never been able to get YouTubeTV to work. I have used Hulu Live, DirecTV, DTV Stream, and others and they all work. In fact I still get like 47 channels from DTV and I haven’t been a subscriber for two years. Just can’t crack the code for YoutubeTV. I’ll keep trying!