If you want to talk to Google Nest Support, you need to start with this link: https://support.google.com/googlenest/gethelp
If you want suggestions from us customers (that's mostly who responds in this forum), what's happening or failing when you try to install your Nest Mini in the Google Home app? Is it new? Do you have other Google Nest devices?
Basic troubleshooting steps
Check that you have a strong Wi-Fi or mobile data connection.
Check your storage space.
Check for Android system updates.
Close & reopen the Play Store.
Uninstall & reinstall Play Store updates.
Restart your device.
Clear cache & data from Google Play Services.
Remove & re-add your Google Account.
This may help you,
Thanks for visiting the Community.
Let us know if you have any questions by responding to this thread.
Chiming in to see if you still need assistance with this. Hope the previous post helped. Let us know if you have additional questions, otherwise we’ll be locking the thread.
Due to inactivity, I'll go ahead and lock this thread in 24 hours. Feel free to start a new thread if you need assistance with your Google speakers and we'd be glad to assist you further.