Deprecated - Retrieve specific campaign instance.

The api to get specific campaign instance v1.0 (v1.0/self/instances/{id}) is deprecated. The end of life is 31-Dec-2025. Use the following alternative API: GET /v2.0/instances/{id}
API request is only valid for resources created using V1 version. Attempting to access V2-exclusive resources with the V1 API will result in a 400 error. Additionally, V2 resources are excluded from V1 API filter search results.
Get a specific campaign instance with at least one record associated with a reviewer or supervisor.
Entitlements required: manageAccessCertification [Manage Access Certification].