Hi,
The Mount-VHD cmdlet is part of the Hyper-V module. Please check the module versions on your servers using Get-Command Mount-VHD
and see if they are the same.
Or you can use Set-CimInstance to set the drive letter. For more details please refer to this link
https://devblogs.microsoft.com/powershell-community/changing-drive-letters-and-labels-via-powershell/
Best Regards,
Ian Xue
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