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I understand that you would like to know the functionality key vault, which has rotate/refresh stored SAS token.
Key Vaults allow you to store and manage several types of objects like secrets, certificates and storage account keys.
You can configure automated key rotation in Key Vault allows users to automatically generate a new key version at a specified frequency.
For more please read About keys and Configure cryptographic key auto-rotation in Azure Key Vault.
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Akhilesh V.
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