Data Action 422 on ServiceNow /api/now/table/incident via Digital Channel Trigger

  • Genesys Cloud: 2024-02.0
  • ServiceNow: Washington DC
  • Integration: Data Action (HTTP POST) from Architect Flow

Stuck on a 422 Unprocessable Entity error when the Data Action fires from a Digital Channel conversation trigger. The payload structure matches the ServiceNow REST API docs exactly, and manual curl tests succeed, but the Architect execution logs show a schema validation failure on the short_description field. Why is the JSON serialization failing only within the flow context?