Analytics API 429 errors during high-volume JMeter test

I can’t seem to figure out why the analytics API returns 429 Too Many Requests when querying interaction data for 500 concurrent sessions.

Using JMeter 5.6 to hit /api/v2/analytics/interactions/query. The rate limit headers show 1000 requests per minute, but we hit the cap at 200.

Is there a specific header or batching method required for load testing scenarios in the US-East region?