I have a Deco network setup, all devices are wifi 6, X20 or higher. All are on the most recent firmware updates. I'm trying to setup a separate network for my various IoT devices, but I need them to be able to talk to each other- hubs talking with local devices- but I want them isolated from my main network with phones and computers etc. 

I started with the guest network but it looks like none of the devices can see or communicate with the others. Can't stream or cast to TVs, smart hubs can't control switches. My Kasa switches, which I thought were cloud connected, don't work either.

I can setup the IoT network but from what I'm reading it offers zero device isolation, just an older/easier way for those devices to hop on the network.

I see several support articles that mention device isolation settings, and I see articles for much older wifi 5 deco units. Have they not rolled this out to the more modern wifi 6 gen routers yet?