I realize there is a direct tv app but I’m doing this for someone who didn’t have a log in and direct tv said it may take 30 days for it to work. In the meantime, I’m trying to get his direct tv box to work with the streambar. The direct tv box is in a different hdmi port on a Hisense tv.
If the Roku Streambar is connected via an HDMI/ARC port, then the TV output should be going through the Streambar. You have to ensure your TV sound settings are using the external sound bar, as it would any other sound bar.
If there is no HDMI/ARC port, the Optical output would be how to connect it. Again, check the TV settings to direct to a sound bar.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
If this post solves your problem please help others find this answer and click "Accept as Solution."
And make sure the Roku tv recognizes the Streambar as a cec device. So all you have to do is program DirecTV remote for the tv, and in turn it will control the Streambar volume.