WFM Evaluation API 429 during JMeter load test

Configuration is broken for some reason… Hitting 429 Too Many Requests on /api/v2/wfm/evaluation/evaluations when ramping to 50 concurrent threads. Using v2.0 endpoint with standard auth token. JMeter shows consistent 100ms latency before the limit hits, but no clear retry-after header in the response. Is there a specific header I need to handle for WFM rate limiting?