Reporting API 429 during JMeter load test on US1

Context:
Pushing 50 concurrent threads against the analytics aggregates query endpoint on Genesys Cloud US1 via JMeter 5.6. Environment uses standard rate limits. The test triggers HTTP 429 Too Many Requests immediately after startup.

Question:
Does anyone know the specific burst capacity for this endpoint or how to configure JMeter timers to avoid hitting the limit?