same problem here: my ID is 1751350061, i'm European but to use all devices correctly, reading some guides, i set Singapore server..
i see in mi app, and yeelight app all my 3 devices (yellight ceiling lamp, colour bulb v1 and white bulb v1)
but in google assistant under the voice "home control" if i press add devices, i found Yeelight Actions with only the Yeelight ceiling lamp, and not the other 2 bulbs.
so i can only control the ceiling lamp with assistant..
can someone help me or check if i have some block in my logs? thx very much