Yeelight 1s not working with alexa

I have been frustrated with this for a month now.
I have Yeelight bulbs: color 1s and they don’t seem to be picked up by Alexa. My mijia bedside lamp 2 has also started to give problems with Alexa
I use China mainland server as with any other server, the device does not pair even to Yeelight or Mi Home app.
Please tell me how to use Singapore server. Whenever I try, the device discovery fails.

Any one got any leads ?
ID : 6347182837