Hello @홍진원 ,
Welcome to the MS Q&A Forum.
It seems example from the "Quickstart: Provision and activate a Managed HSM using PowerShell" creates some confusion by providing "westus3" as the location parameter value.
From what I found, Azure Dedicated Managed HSM at this moment is not available in the WestUS3. (Azure Pricing)
I tested deployment in the East US and it went through without any failure:
Hope above answers your questions and concerns.
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Sincerely,
Olga Os