Set-ADUser : Cannot find an object with identity: 'System.DirectoryServices.DirectoryEntry.DistinguishedName'

Hi,

I've based a small amount of Powershell code off the code I've found here: http://halfloaded.com/blog/powershell-using-posh-to-search-across-multiple-domains-in-forest/

The function enumerates the domains in the forest, matches one if it finds the keyword "giraffe" then attempts to clear extensionAttribute8. The issue looks to be a mismatch in object types but I can't figure out how to fix it.

Please help!

cls
# Find forest
$objForest = [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()

# Find Domains
$DomainList = @($objForest.Domains | Select-Object Name)

# Split into full domain names
$Domains = $DomainList | foreach {$_.Name}

# Act on each domain
foreach($Domain in ($Domains))
{
	$ADsPath = [ADSI]"LDAP://$Domain"
	$objSearcher = New-Object System.DirectoryServices.DirectorySearcher($ADsPath)# Filter based on LDAP syntx$objSearcher.Filter = "SamAccountName=davetestuser"
	$objSearcher.SearchScope = "Subtree"
	$colResults = $objSearcher.FindAll()
	foreach ($objResult in $colResults)
	{$userDomain = $objResult.GetDirectoryEntry()        if ($userDomain.DistinguishedName -match "giraffe"){        Set-ADUser -identity "$userDomain.DistinguishedName" -clear extensionAttribute8 –errorvariable SetADUserClearArchiveCodeErr
        }     
	}
}

It errrors with:

Set-ADUser : Cannot find an object with identity: 'System.DirectoryServices.DirectoryEntry.DistinguishedName' under: 
'DC=giraffe,DC=co,DC=uk'.
At C:\tempLoopingThroughDomains.ps1:26 char:9
+         Set-ADUser -identity "$userDomain.DistinguishedName" -clear extensionAtt ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (System.Director...stinguishedName:ADUser) [Set-ADUser], ADIdentityNotFoundException
    + FullyQualifiedErrorId : Cannot find an object with identity: 'System.DirectoryServices.DirectoryEntry.DistinguishedName' under: ''DC=giraffe,DC=co,DC=uk''.,Microsoft.ActiveDirectory.Management.Commands.SetADUser