YouTube as source Fail

When I add YTTV, I'm entering my gmail address & password. It returns "Cable Provider Authentification Failed" message. It shows an AMC sign in or Sign in with Google, which I can't access.

I have turned off 2FA. I can login to nbc and YTTV in Chrome.

I also use Playon, which is able to send me to the actual login page for hulu or YTTV. It works great.

Any suggestions? This seems similar to the Hulu sign in issues.

Thank you.

Need more info:
What is your server, Windows, NAS etc
I works differently depending on your Server type as far as I know.
What release.

It's a Windows 10 OS and the storage is local, not using an NAS.

I get this screen showing the failure to login.
YouTube Authentication Fail

Same thing is happening with me on Windows 10 as well.