Hi @Wellington , please read about the differences between the two types of publishable apps:
The endpoint that requires the scope is this one: Accounts APIs
There is no user-level scope for that endpoint so only people with the permission and role of Admin or account Owner would be able to use that endpoint. If the app you’re building requires the use of this endpoint, you are right to create an admin-level app. However, the admin-level will limit the app to admin-level users and above, so a regular user can not add it.
I am not sure your app is published. It sounds like it would not pass marketplace review at this time. You may have installed the app locally or used the auth url feature.