Test-ADUserProperties.ps1

$user = Get-ADUser TestUser -Properties *
$props = $user.psobject.properties.name
$users = Get-ADUser User1
# or test all AD Users
# $users = Get-ADUser -Filter *
foreach ($user in $users){	
	try {
		$User | Get-ADUser -Properties * | Out-Null
	}
	catch{
		Write-Output $user.SamAccountName
		foreach ($prop in $props){			
			try {
				$user | Get-ADUser -Properties $prop | Out-Null
			}
			catch{
				Write-Output "    $prop"				
			}
		}
	}
}