Hi @Ayca Akcay
Reporting Services provides an authentication subsystem and a role-based authorization model. Authorization is based on the roles assigned to the principal. Each role consists of a set of related tasks, which in turn consist of a set of related actions.
For more details about role assignments, you can refer to this link: https://learn.microsoft.com/en-us/sql/reporting-services/security/create-and-manage-role-assignments?view=sql-server-ver16.
Best regards,
Aniya