Adding unknown device to zigbee2mqtt - not showing up in HA

Using hass.io - all latest versions.

Trying to add this https://nordtronic.dk/shop/box-dimmer-2-712p.html but it is unkown to zigbee2mqtt.

Tried following https://www.zigbee2mqtt.io/how_tos/how_to_support_new_devices.html :

  • Added to devices.js then re-paired the device. It is no longer unknown to zigbee2mqtt.
  • Added device id in ‘mapping’ in extension/homeassistant.js

But still the device is not added to Ha. Any ideas?