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Please review the Microsoft 365 Defender role-based access control (RBAC) documentation
The Microsoft 365 Defender role-based access control (RBAC) model provides a single permissions management experience that provides one central location for administrators to control user permissions across different security solutions.
MS 365 defender has several roles defined (for example Security posture – Posture management) but you can define your own roles
Also:
Permissions and roles can also be managed in the Microsoft 365 Defender portal:
- Sign in to the Microsoft 365 Defender portal at security.microsoft.com.
- In the navigation pane, select Permissions & roles.
- Under the Permissions header, select Roles.
Hope this helps!
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