The power and volume buttons on wifi-direct Roku remotes send the appropriate signals to your TV via line of sight infrared (IR) signals. Different tvs have different sets of IR codes they accept, so you have to set up the remote to send the signals for YOUR tv.
Roku menu path:
Settings -> Remotes & devices > Remotes > Remote (In use) > Set up remote for TV control
... then follow the prompts.
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