Data Action Timeout During IVR High-Concurrency Testing

I’m completely stumped as to why 408 Request Timeout occurs on our custom Data Action when Architect processes over 50 concurrent calls. The endpoint is verified via Postman with sub-200ms latency. This happens specifically in the US-East-1 org during peak load tests. The Premium App logs show the request was sent, but Genesys Cloud never returns the payload to the flow. Is there a specific timeout configuration for external API calls within Architect nodes that overrides the standard gateway settings?