Outbound Preview Dial API 429 with low concurrency

  • Genesys Cloud Sandbox
  • JMeter 5.6.2
  • 5 threads, 50ms ramp-up

Can anyone clarify why /api/v2/outbound/campaigns/{campaignId}/preview returns 429 Too Many Requests immediately? The rate limit header shows limit=100 but it blocks after 2 requests. JMeter config is basic HTTP request.