In an attempt to figure out why my room assignments kept going missing, I unlinked Hue from the Google Home app. When attempting to re-link, Home is not discovery HA/Emulated Hue devices.
I’m having the same problem with Alexa. Had to delete and I’ve pulled my hair out the last few weeks trying to get it back again. Not sure what happened. It’s hard to troubleshoot because there’s no error logs.