I have a Nest that was controlled on my Google Home app. I recently repaired my furnace and reinstalled the thermostat control wires. I then reset the Nest, connected to my Wifi, but my Home App will not synch with the Nest now. Any suggestions?
Sorry for the delayed response but thanks for reaching out to the Google Nest Community.
To confirm, are you logging into your Nest app using a migrated Google account? If yes, are you signed into your Google Home and Nest app using the same Google account? You might also want to check for other home/structures in your Google Home app if the thermostat is there. Check this out for the steps: https://bit.ly/38DScyu
I wanted to jump in and see if you were able to obtain that error code? I am sorry for the frustration that has occurred as well. I would be happy to review and ensure all your devices are able to be seen in the app. Please let me know what troubleshooting steps you have already tried as well. Do you mind me asking if your router has both 2.4 GHz and 5 GHz bandwidth? There may be a chance they are connecting to the other bandwidth and that is why it could be showing not on the same Wi-Fi. Please let me know.