I’m curious as to why the /api/v2/oauth/token endpoint starts returning 401 errors when JMeter hits 15 threads from Singapore? The initial grants work fine but subsequent refresh calls fail immediately during the ramp-up phase.
Running JMeter 5.6.2 with standard OAuth client credentials. The logs show no rate limit 429s, just straight 401 Unauthorized responses after the first few seconds of concurrent requests.