Is it listed on the official zigbee2mqtt page? 
| Zigbee2MQTT
If it is: remove device and try again until it’s recognized. If it’s not listed there, then the device is not supported so it will never work unless zigbee2mqtt adds support. See this to ask for new device support | Zigbee2MQTT
P.S. You could have just asked this in the long going thread instead of creating a new one with a single question Zigbee2mqtt: getting rid of your proprietary Zigbee bridges (Xiaomi, Hue, TRADFRI). You’ll have higher chances of finding others that use this device there as well, which allows others to be informed as well.