Predictive Queue 429s during JMeter Ramp

I’ve spent hours trying to figure out why…

  • Predictive routing queue returns 429 errors during JMeter ramp-up in us-east-1
  • Simulating 150 concurrent calls via API v2/interactions/calls
  • Rate limit headers show X-RateLimit-Remaining hits zero instantly
  • Constant Throughput Timer set to 10 req/sec
  • Tenant is on Enterprise plan
  • Error persists even after reducing concurrency to 50