AppArmor Command is somewhat complex in the way it handles users. Understanding how these are managed is a critical element of a successful deployment. This comment contains a helpful overview of what you need to know.
Definitions
The following 3 definitions are important to understand. It's also important to understand that the user-related features below are managed separately. Users may appear in one or more of the following:
Unable to render {children}. Page not found: Users and Groups.