Roku do not have a power command, only roku 4 ever did, power key on the roku remote is a tv power key. If you no longer want the remote to control your tv power, it won't control the volume either, they're connected. Go into settings> remote & devices> remote> remote in use> program tv> when the volumes mutes click NO, keep clicking NO, until it really doesn't mute it and then click yes.
Edmund
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