Adding Hue Tap to Zigbee2mqtt - JiltedGeek/HomeAssistant GitHub Wiki

Pairing:

This device requires your Zigbee network to run on channel 11, 15, 20 or 25. In order to pair it hold the corresponding button for that channel 10 seconds.

You can find the Zigbee channel in the Zigbee2mqtt add-on under: Settings -> Advanced