Retrieves the assignment statistics of the campaign instance from the specific tenant.

The API is used to retrieve aggregated statistics of assignments in a given campaign instance. Filters could be applied to refine the entities to use for generating statistics.
The owners of the application can retrieve aggregated statistics of the campaign instance that is created by them or includes at least one application owned by them.
Entitlements required: manageAccessCertification [Manage Access Certification].