Microsoft Defender for Endpoint offers a solution for managing cross-vendor server monitoring through Device Groups and Role-Based Access Control (RBAC). Device groups act as the primary scoping unit, allowing administrators to categorize servers by vendor or company. These groups can be populated automatically using matching rules based on tags, operating system, or naming patterns. RBAC roles are then linked to Entra security groups, granting specific permissions only to designated device groups. This ensures that users within a particular company's Entra group only see their assigned servers, alerts, and incidents within the Defender portal. Global administrators maintain full visibility across all device groups. The setup involves creating device groups under Endpoints > Permissions > Device groups and then configuring roles and Entra group assignments under Permissions > Roles. It's crucial to note that this RBAC model scopes alerts, incidents, advanced hunting, and inventory, but not organization-wide features like global threat analytics. For servers managed via Microsoft Defender for Cloud and not onboarded to Defender for Endpoint, Azure RBAC at the subscription or resource group level provides a similar scoping mechanism. Clarifying which Defender product is in use is essential for recommending the correct solution.