I am unable to get any discovery channels to authenticate. I just tried removing the TVE source and adding it back in and noticed this
The WAF is way down hill right now not having access to Food network in Channels 
I wonder if it has to do with this ....
Discovery takes control of HBO, CNN, and Warner Bros., creating new media giant - CNN
Not sure…but this is happening for all Discovery channels and they have been missing for a while (not exactly sure how long)
Mine are all working on XFINITY.
Good call, I have Directv Stream.
I went to the URL in the error. It prompts me to chose my provider and I am able to log right in...
I'm using Philo login details and everyting is working great here.
Directv Stream here - no issues with either
I deleted again, updated to the latest pre-release, added the source back and they added this time.
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I just tried with a new Sling TV account and I'm getting the same problem. Navigating to the URL, it appears that perhaps Sling may not be supported anymore:
And Sling doesn't appear when you search for it.
If that's the case, then Sling is no longer participating in TVE for that network.
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