Starting in the next few weeks, private app permissions will be set to Off by default in all non-Plus stores. This ensures that merchants opt in to all private apps and understand the permissions they’re giving to developers. All current private apps will continue to function, but cannot be modified until merchants re-enable private apps in the Shopify admin.
If you are looking for an alternative to private apps when building bespoke apps for merchants, consider using custom apps.
To learn more about private app permissions, please visit the Shopify Help Center.