Can connect to Mi Home EU server, but not Mainland China

Hi! I can connect the bulb to EU server (and some others, like Singapore, Russia), but not to Mainland China or US server. If I select EU server, then the bulbs are discovered automatically. If I select Mainland China server, then the bulbs are not discovered, even I can’t add them manually. All my or Mi devices use Mainland China server. Can you please help me how can I connect the bulb to the Mainland China server?

You don’t need to post several times…

You product model please.