To enable the Managed Security Service Provider (MSSP) feature on FortiSASE, the administrative framework must be established outside of the local SASE instance within the broader FortiCloud ecosystem.

FortiCloud IAM Integration: The FortiSASE MSSP portal relies on FortiCloud Identity & Access Management (IAM) to define the scope of management for internal teams. Administrators do not create local "MSSP users" within the SASE portal itself; instead, they must use the FortiCloud IAM portal to assign specific Role-Based Access Control (RBAC) to IAM users.

Permissions and Scope: These RBAC settings determine which customer tenants (Organizational Units or OUs) an MSSP administrator can view, configure, or monitor. Without the proper role assignment in the IAM portal, the MSSP portal and its multi-tenant viewing capabilities will not be accessible to the user, even if the account has the necessary licenses.

Hierarchical Management: Once RBAC is correctly assigned, the MSSP administrator can leverage the FortiCloud Organizations service to manage multiple customer accounts from a single pane of glass. This centralized approach ensures that security policies and configurations can be standardized across the entire customer base while maintaining strict data isolation between tenants.

According to the FortiSASE 25 Multitenant Deployment Guide, configuring the IAM portal is the primary prerequisite that grants an MSSP internal team the permissions necessary to perform operations on customer FortiSASE tenants.