Why would you need to re pair it if you just turned it off? With my hue bulbs if I turn off the light switch they are connected to, I just turn it back on and within a few seconds they are reconnected ready to go.
Same problem. I have almost 50 hues lights. They are all synced with Google Home, and have been for a very long time. Today, I cannot control the Hues lights with the Google Home App or with Google Assistant voice commands over any google home device. I can see the lights in the app, but there is an error message everytime I attempt to turn them on or off. I have tried to resync my Philip's Hues account and I get the error message, "Could not reach philips hue. Please try again." All of the lights can be controlled through the Philips Hues App without issue. They just cannot be controlled through Google. Other non-Philips Hue devices work as normal through the Google Home App. It seems to be a specific problem between Google and Philips.
I successfully paired the Philips Bulb and Google nest mini with the following process:
1. Reset the bulb to factory setting. (don't pair it with Philips Hue app)
2. Add the device in Google Home.
I believe I reset the Philips Hue Bulb by Philips Apps (BT), and I used the Philips Apps (BT) paired the bulb. I think the bulb could not link to Google Home after I paired with Philips Apps (BT).
Thanks for your help.