WFM Quality API 429s on minimal JMeter load

No idea why this is happening, the WFM Quality API is throwing 429 errors immediately. Running JMeter 5.6.2 with just 5 threads against Genesys Cloud BYOC Edge 24.1.0 in Asia/Singapore. Testing the evaluation endpoint specifically.

Getting HTTP/1.1 429 Too Many Requests. The rate limit headers suggest we are hitting the global limit, but 5 threads should be negligible. Is there a hidden throttle on quality endpoints for BYOC instances?

threads: 5
ramp_up: 0
loop_count: 1
endpoint: /api/v2/wfm/quality/evaluations
auth: Bearer token (valid)

Any ideas on what am i doing wrong here?