https://learn.microsoft.com/en-us/powershell/module/az.compute/set-azvmssdiskencryptionextension?view=azps-15.6.0
Set-AzVmssDiskEncryptionExtension (Az.Compute) | Microsoft Learn
The Set-AzVmssDiskEncryptionExtension cmdlet enables encryption on a VM scale set. This cmdlet enables encryption by installing the disk encryption extension...
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