POST /api/v2/data-actions/instances returning 422 Unprocessable Entity with "code":"invalid.request","message":"Validation failed for one or more fields." when pushing a nested JSON object via Genesys Cloud Data Action to ServiceNow REST API. The payload structure matches the ServiceNow incident.create schema exactly, yet the validation error persists even after removing all optional fields. Environment: Genesys Cloud EU1, ServiceNow London instance, Architect v2.1.
The documentation actually says nested objects in Data Actions need explicit type mapping in the schema definition, otherwise the platform rejects the payload structure. Check that your input schema matches the nested JSON hierarchy exactly.