OAuth token refresh failing during high concurrency JMeter test

Configuration is broken for some reason… Running JMeter 5.6 on US1 with 200 threads simulating agent logins. The initial OAuth2 token fetch succeeds. But after 5 minutes, concurrent requests fail with 401. The token refresh endpoint seems to hit a wall. Is there a specific rate limit for /api/v2/auth/tokens during load testing?

“{“status”:401,“code”:“unauthorized”,“message”:“Invalid or expired token”}”

Need to validate security compliance for scale.