Xfinity stream beta app does not show the channels on my LG smart tv although i have a streaming plan. But i can stream on my phone. Comcast has not figured out the root cause yet. Disappointing.
Which exact model LG TV do you have? If you've found the Xfinity Stream Beta app in the LG Content Store->Apps & Games then the app (thinks it) supports your model. What 'Streaming Plan' do you have?