Quick question about Outbound Campaign Data Action 403 Forbidden

Quick question about a 403 Forbidden error when an Outbound Campaign triggers a Data Action to ServiceNow. The integration uses a specific API key for authentication, yet the POST /api/now/table/incident fails immediately with a 403. The same key works perfectly for manual testing via Postman and other Data Actions within the same environment. The Architect flow logs show the payload is valid JSON before the HTTP request is initiated. Genesys Cloud 2024-03.0. Any thoughts on why the outbound dialer context might be rejecting the credentials?