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For reasons that have not been stated, Verizon does not have access to the Discovery family of channel Go apps.
This is still an issue April, 2018. It's up to Verizon to nail down all the issues with the agreement they have with Discovery networks. It's pretty embarrassing when setting up the mobile app or Roku access and Science Channel has nearly a hundred cable providers listed yet Verizon is conspicuously missing . This is likely the same kind of shenanigans that has led to us not getting the Weather Channel also. What premium, ultra HD package doesn't have the weather channel?
A month or so ago, Verizon signed a deal with Discovery for access to all of the GO Apps.
What is the issue? Is Verizon not listed as a provider or can you just not log in?