Cut a long story short - Installed two Philips Hue Lights with my google nest minis. Then lost connectivity around mid Nov 2022 and when tried to reinstall, lights could not be found on Google Home App.
Searched high and low for a fix and found one.
Got to bottom of this link
Set up Philips Hue App on your phone and install lights to that app then connect to Google Home app. Works as it used to and can no control lights with voice commands. Was an update on nov 17th which rendered the lights useless..
Hope this helps