I get blocked with the message: ”Unfortunately you don't belong to a user category that is allowed access to this resource”, why?

Your access is dependent on which university you belong to.

In the database list, resources available for either RKH or SH are listed. Some can be accessed by students and staff members affiliated at both universities, whereas some are only accessible for one of the two universities. If you get this message, you have tried to access a resource not accessible for your university.