Apple TV Remote does not work

What is your model Apple TV? Identify your Apple TV model - Apple Support

What is your model remote? Identify your Apple TV remote - Apple Support

For the Siri Remote with Apple TV (4th generation or later), see here how to get a good but non-working remote back to functionality:

If your Siri Remote or Apple TV Remote isn't working - Apple Support

Charge your Siri Remote - Apple Support

have you tried charging it or changing it's battery if it's an old model that have a battery you can change

How to replace the battery in your Apple Remote - Apple Support

yes, had to buy a new appletv HD remote because wife had dropped it in her footbath several times, it still worked if connected to the charging cable though