I bought a Roku Premier - I realize the Roku remote it came with doesn’t have volume control. No problem.
but why can’t I control my television volume with my television remote?
only an issue when using Roku. Tv remote and tv volume control work fine when not using Roku.
That sounds like a TV issue. Does the volume work with any other HDMI connected device like a Blu-ray player or cable box? Is there anything in the TV settings that might affect it?