Chris,
Can you confirm you have issues with Android builds only?
Just to clarify - your builds (both Android and iOS) are successful but Android version lacks the push JSON files? Is this the issue you are concerned with?
Important - please clarify as well if you created the app under question from the backup, if so - such behavior is to be expected as all the Push settings need to be recreated in this case.
In this connection, I would like you to know that by making a backup of an app you can save all the created pages with their UI and services, enabled plugins, libraries versions, keys and binaries, themes, JavaScript, CSS, etc.; the structure of the application also remains unchanged.
But if you need to create a backup of the database for further use, for example, you will need to save it separately by exporting its data to JSON or CSV (to do it, go to the Settings tab). The same applies to API Express projects, Push notification settings, etc.
Also, could you please provide us with more information on the plugin School App you use in your app as well?