Can't seem to find any in depth discussion to troubleshoot problems and I suppose this thread is as good as any to try and get someone to help me troubleshoot.
I have talked to Apple Support, and spoke to a Apple iOS Senior Advisor. While he wanted to help, he just didn't have the technical knowledge about how HomeKit functions. I think I have isolated a specific problem, which I am hoping someone else can confirm. If you have multiple devices logged into the same iCloud account, with Keychain turned on, they are supposed to sync. But if you add a new HomeKit device while one of the devices is not on the same Wifi, then it seems that this device gets permanently left out of the loop. No matter what you do -- reseting, turning Keychain off and on again -- it never gets the device. Further, it seems that it won't get any additional changes from that point forward. It is forever out of sync, though it can control devices that has already synced prior to the glitch. Is this anyone else's experience?