Why might an HR user be unable to open an app after accessing the HR stream?

The reason an HR user might be unable to open an app after accessing the HR stream is due to section access, which is a security feature in Qlik Sense designed to restrict data visibility based on user credentials. If the section access settings for that specific app are configured to limit the HR user from viewing or accessing the app's content, the user will be blocked from opening it.

Section access operates by managing permissions at a granular level, determining what data each user can see or interact with. If the HR user's credentials do not meet the requirements set in the section access for the app, they will not be able to gain entry. This is why understanding section access is critical for administrators, as it directly controls access to specific data and applications.

For the other choices, while they may seem valid in different contexts, they do not directly address the core issue of visibility restrictions based on security settings provided by section access.