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.