Platform API 429s with low thread count in JMeter

Context:
Running JMeter 5.6.2 from Singapore against the Architect flows API. Only 10 concurrent threads active. Hitting 429 Too Many Requests instantly despite valid OAuth tokens. Standard GC rate limits seem to apply even at this low volume.

Question:
Does anyone know if there is a strict per-IP throttling for architect endpoints specifically? The docs mention global limits but this feels aggressive for 10 threads. Checking headers now.

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