I’m posting in this thread instead of starting a new one.
I have successfully added my Aqara U200 in Google Home.
In Home Assistant I have as prefered network the one my nest devices created and I have synced crendentials multiple times and with multiple devices.
IP6 works fine in my network, it is activated in my NAS and I can see that Home Assistant get an IP6 IP.
I tried adding the Aqara U200 in home Assistant via Google Home app with Android and iOS devices with no luck.
I have started from scratch (resetting U200) with exactly the same results.
The only thing that I haven’t tried is to use Conbee II as thread router and add it to the same network with OTBR.
Any help appreciated.