Apple TV remote mic does not function

I don’t know if there are other possibilities than a hardware defect or mic blockage for this change in behavior. At this time, I would suggest to contact an expert from the Apple Support staff for further assistance with your remote hardware. Contact Apple for support and service (phone numbers) or start your support request online (chat/​email/​callback).

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

Siri Remote at a glance - Apple Support

Keep the button pressed while talking to it.

Siri is available for answering some questions and to voice-operate some functions in select countries with select languages.

Use Siri on your Apple TV - Apple Support

Siri on Apple TV is somewhat similar, but a different/separate implementation compared to other devices.

The microphone is also available for dictation in text input fields.

Use Siri dictation on Apple TV - Apple Support