Apple TV remote volume button not working
volume button does not work
[Re-Titled by Moderator]
Apple TV HD, tvOS 15
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What is your audio system setup?
The Siri Remote uses the standardized signals for volume control. If that doesn’t work with with your particular setup, then you can Learn New Device.
The Siri Remote uses IR directly to the TV or audio system, unless you have an AV receiver that supports volume control over HDMI-CEC, or if you use certain AirPlay or Bluetooth speakers.
To adjust the settings, go to Settings﹥Remotes and Devices﹥Volume Control﹥.
If your Siri Remote doesn’t work when the settings are right, then try to restart the remote as described on: If your Apple TV remote isn't working - Apple Support.