Thread/Matter - HomeKit
For those having problems, it is the Matter upgrade for HomeKit accessories - HomePods etc.
Once you upgrade to Matter on your iPhone/iPad/Homepod then you lose your HomeKit on your Mac if you are running an older OS (Monterey in my case).
I found this out after I purchased an EVE Energy plug. If you go to the Eve site it states that once you upgrade your HomePods etc to MATTER then you can no longer go back and HomeKit to older Macs will not work! Unfortunately I found this out too late and the information is a little buried on the EVE site - try the BLOG.
Needless to say, I cannot get the plug to work apart from just two occasions initially, then no Thread network which runs through the HomePods...
I am finding EVE support pretty poor.
iPhone 14 Pro, iOS 16