Welcome to the Roku Community and thanks for posting regarding the issue you are experiencing with your remote controlling the TV power and volume.
Can you please provide more specific information about the issue you are experiencing? What specific Roku model devices are you using? Do you know what firmware your remotes are on these devices? You can find this information via Settings > Remotes > (your remote) > About.
Please keep us posted with the information we have requested and we will be able to assist you further.
Roku Community Moderator