Nest no longer supports Nest Secure. It will not be accessible in the Nest app and will no longer connect to the internet. You cannot use the Nest app to check the status of your Nest Secure, control your Nest Secure devices, or receive notifications from your alarm system.
For more information, go to this Community Forum post.
If you sign into the Nest app with a Google Account, you can manage home members in the Home app. Keep in mind that only home members who also sign in with a Google Account will be able to see your Nest products in the Nest app.
Family accounts let other people share access to your home and your Nest products in the Nest app. Depending on the level of shared access you choose, people you invite can add, remove, and control Nest products in the Nest app.