I doubt that it is a TCL problem because I am only having trouble with one app. So you are saying that Roku does not support the YouTube TV app? If so, I will ask YouTube TV. Thanks.
Roku does not support any of the channels they do not themselves provide. And they only provide two channels, The Roku Channel and Roku Media Player. All other channels are supported by their providers. For YouTube TV, that would be Google, as they own YouTube.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee, just another user.