Hello 유진,
Currently, PTU can only be contacted and purchased through the Microsoft sales/account team, as mentioned in the document you provided, "If you don't have a sales/account team, unfortunately at this time, you cannot purchase provisioned throughput."
Incidentally, I have had the opportunity to receive a quote, and I can only tell you that the price may not be very friendly, but the latency is guaranteed.
Best regards,
Charlie
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