Why you use Get-ADgroup and Get-ADUser? You does not install this powershell components in previous step scripts.

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SDN/VMM/Templates/NC/NCSetup.cr/ValidateParameters.ps1

Line 55 in d56fe83

$user = Get-ADUser -Filter "Name -like '$userNameOnly' -or SamAccountName -like '$userNameOnly'"

You must install this components in PrepareNodeForNetworkController.ps1. But you does not install it.