After I upgraded my google account to Advanced Protection Program and add two hardware security key my Google Nest Hub keeps showing the display "Link Account". I went on to Google home and it had me authorize the account using my security key but the Hub Still show the same message. I have reboot and power cycled the Nest hub many times but still no luck.
On the Google Home app the Hub shows that it is linked to my account but does not work.
Thanks for reaching out and we appreciate the troubleshooting you did. You can factory data reset your Nest Hub and set it up once more. See the instructions below:
On the back of Nest Hub, press and hold both volume buttons together for about 10 seconds. Your Nest Hub will let you know that it's resetting.