I am in Singapore and my home has 5 Yeelight Jade Smart LED Ceiling Light C2001 - but when I add them they can be added, but disappear about 1-2 seconds after adding them.
In my app, they appear as 未知设备 - and are offline…
My pendant lamp and lightbulb works fine. I’m super worried not as I bought 5 of them for my entire house and they don’t seem to work.