Architect IVR DTMF webhook to ServiceNow failing with 408 Timeout

Quick question about the ivr.gather.digits.completed webhook triggering a ServiceNow Data Action. The payload hits the SNOW endpoint but returns HTTP 408 Request Timeout consistently. The Architect flow waits 5s for DTMF before firing. ServiceNow REST API logs show the request never arrives. GC version is 2024-10. Is there a known latency issue with outbound webhooks from Architect blocks when routing to external REST APIs, or is this a timeout configuration mismatch?