If you use oauth/sso you can't link to home device. I registered using single sign on, using Google. Then I went to pair it with my Google home, and was taken to a login page to input my username and password. Obviously with SSO I had no password, so I could not proceed. A warning to anyone who uses this, if you want to pair it with the rest of your smart home you need to create a standard username/password account and not use SSO.