Azure - Manifest Ingestion - Performance Load testing 50k records - 413 response

Getting below error while submitting request for performance load testing 50k records -

DEBUG:root:Response: 413 DEBUG:root:json = {"timestamp": 1662643629785, "status": 413, "error": "Payload Too Large", "message": "Request content exceeded limit of 2000 kB", "path": "/api/workflow/v1/workflow/Osdu_ingest/workflowRun"}

fyi, successfully able to complete performance load testing for 500 & 1000 records.