Yeelight 1S homekit from different network


I recently bought new color LED Yeelight 1S and tried to make them work with homekit from different VLANs (bulbs are in an IOT SSID and my idevices are in a other SSID).

But it does not seems to work with different network … Is it normal ?
I am only able to see the lights when I join in the same SSID of the bulbs.

I was able to do that with my previous generation of yeelight bulbs…
Does someone has an idea ?

Many thanks for your help !