This error happens when your smart bulb or plug loses sync with the cloud.
- Reboot the Hub: Unplug your Google Nest for 60 seconds.
- Check Wi-Fi Bands: Ensure both the phone and the device are on 2.4GHz (not 5GHz).
- Reconnect Account: In the Google Home app, unlink the manufacturer’s service (like Tuya or Yeelight) and link it again.