Trouble adding HZC Smart Dimmer (D688-ZG)

When I am trying to add the zigbee HZC Smart Dimmer (D688-ZG) to Homey it turns up as a unknown Zigbee device. I have installed/added the HZC app (HZC electric App for Homey | Homey). As it is right now I can’t include the device in any flow or automation.

Any one knows if the Smart Dimmer (D688-ZG) is not supported yet? Or have any contact details to the developer?
Any suggestions on how to successfully add this device to Homey are welcome!