Google Nest Community

Adding another google account seems to at least to have made the device usable again

I added a second account to the device and am now able to use it. First account still doesn't work, but I can use the device normally.

I'm having the exact same issue on the same day as you. Just keeps looping me back to verify it's you over and over again.Google support is useless as per usual, they just tell me to factory reset the device.