https://docs.microsoft.com/en-us/azure/devops/organizations/security/access-levels?view=azure-devops
Supported access levels
Assign users or groups of users to one of the following access levels:
- Stakeholder: Provides partial access, can be assigned to unlimited users for free. Assign to users with no license or subscriptions who need access to a limited set of features.
- Basic: Provides access to most features. Assign to users with a Visual Studio Professional subscription, an Azure DevOps Server CAL, and to users for whom you're paying for Basic access in an organization.
- Basic + Test Plans: Provides access to all features included in Basic, as well as Azure Test Plans. Assign to users with a Visual Studio Test Professional or MSDN Platforms subscription, and to users for whom you're paying for Basic + Test Plans access in an organization.
- Visual Studio subscription: Assign to users who already have a Visual Studio subscription. The system automatically recognizes the user's subscription—Visual Studio Enterprise, Visual Studio Professional, Visual Studio Test Professional, or MSDN Platform—and enables any other features that are included in their subscription level. If you assign Basic or Stakeholder, they also receive their Visual Studio subscription benefits upon sign-in.
