How does one move HomePod (and its connected devices) to a new network?

How do you move the homekit to another network?

Tons written about it... switch networks and Home app will give a notification and prompt to switch networks. The prompt works most times to bring HomePod to the new network HOWEVER doing so does NOT bring the 50+ IoT devices.

Network 1 (old) works fine. If Home is connected to Network 1, devices operate as expected.

Switch over to Network 2 (new,) activate the prompt to move HomePod to Network 2 and that goes smoothly...HomePod now on Network 2 BUT not a single IoT device No Response. all IoT show No Response.

Only way to access them is to switch back to Network 1.

How do I move the home network to the new network at one shot (vs. factory resetting each and every device and starting over from scratch?)