Thanks for posting here in the Google Nest Community.
This is not the experience that we wanted you to have, let me help you out. A few things: are you trying to use the Home/Away Assist or Home & Away Routines? Which Nest devices do you own? Is this the first time that you are setting it up or it was working before? Check the information below to know the difference between the two features.
Home/Away Assist is a Nest app feature that automatically changes Nest devices’ behavior based on home occupancy status, determined by phone geolocation, device sensors, or a combination of the two. It's available to both non-migrated and migrated Nest Account customers.
Home & Away Routines is a feature of the Google Home app available to customers with Nest devices and services with a Google Account.
You can check these links for more information.
Keep me posted.