So what is the answer
A Roku voice remote does commands such as "launch Disney" or find "The Fast and the Furious". A Roku voice remote does not have the ability to take commands once you are within a channel such as watch DirecTV Stream and saying "Go to HGTV". That is not how it works.
https://support.roku.com/article/360009552694
"Note: Not all channels support all commands. We continue to evolve and expand Roku Voice, with a focus on helping you get to your favorite content quickly. We are continually working internally and alongside channel partners to expand functionality and expect it to improve over time."
