If you want to check the existence of any user or group in Windows Active Directory, use the following PowerShell script.
PowerShell: Check if AD User or Group Exists
Step 1. Open PowerShell with elevated privileges.
Step 2. Execute the following script:
$userobj = Get-ADUser -LDAPFilter "(SAMAccountName=$username)" $vlanobj = Get-ADGroup -LDAPFilter "(SAMAccountName=$vlangroupname)" if ($userobj -eq $null) {"User not valid"} if ($vlanobj -eq $null) {"VLAN not valid"}