pair apple tv remote to tv

You don’t. You can pair the Siri Remote to the Apple TV box, not to a TV set or anything else.

To control (wake|sleep) your TV indirectly with the Siri Remote, activate CEC.

Control your TV or receiver with your Apple TV Remote - Apple Support

To control volume, the Siri Remote can already do that without any configuration, via its IR transmitter (not bluetooth).