I have a couple of these lights and they have quite a specific way to pair/reset the connection with the zigbee hub.
- First of all keep the light off for at least 30 seconds
- Turn the light on for 1 second
- Turn the light off for 6 seconds
- Turn the light on for 1 second
- Turn the light off for 6 seconds
- Turn the light on for 1 second
- Turn the light off for 6 seconds
- Turn the light on for 12 seconds
- Turn the light off for 6 seconds
- Turn the light on for 12 seconds
- Turn the light off for 6 seconds
- Turn the light on and keep it on
The light should flash and then stay on on bright white.