# SCCM : Refresh Device Collection Memberships

I'm in the finishing stages of a new SCCM deployment, but also in the process of an Active Directory consolidation at the moment, and ran in to the following issue:

A machine from **Domain A** has been re-imaged using SCCM to run in **Domain B**.
SCCM has a _Device Collection X_ for **Domain A** and _Device Collection Y_ for **Domain B**.
_Device Collection Y_ has a Deployment for a specific VPN Application that's required, otherwise it won't run.

# The Problem

The engineer that re-images the machine forgot to remove the machine from **Domain A** and therefor doesn't get the VPN Application, as the Client is still recognized as being an active machine on **Domain A**, taking precedent over the fact that it ALSO exists in **Domain B** now [same MAC address etc].

# The Solution

By manually removing [yes, this needs to be automated at a later time as well] the old AD machine from **Domain A** and refreshing the Device Collection's memberships, the issue can be resolved.

Normally this is something that gets done on a regular interval [in this case, every 24h], but we need to force it, sometimes for multiple Device Collections.

Instead of using the clunky GUI, PowerShell's to the rescue 🙂

There is a <a href="http://RequestRefresh Method in Class SMS_Collection" target="_blank">WMI Method in the SMS_Collection</a> which does exactly what we require: Refresh the Membership of a Collection 🙂

# The Code

Here's the code that does the trick for me

```powershell
[CmdletBinding()]

param (
$SiteCode = 'AMS',
$SiteServer = 'CM01.contoso.com'
)


begin {
Write-Verbose "Starting '$MyInvocation.MyCommand'"
Write-Verbose "Sitecode is '$SiteCode'"
Write-Verbose "Siteserver is '$SiteServer'"
Set-location -Path "$SiteCode`:"

Write-Verbose 'Selecting Device Collections to refresh'
$DCollections = Get-CMDeviceCollection | Select-Object Name,CollectionID,MemberCount,LastChangeTime,LastMemberChangeTime,LastRefreshTime | Sort-Object Name | Out-GridView -PassThru -Title 'Select the Device Collections to force refresh'

}
process {

if ($DCollections) {
    foreach ($DCollection in $DCollections) {
        Write-Verbose "Refreshing Device Collection '$($DCollection.Name)'"

        $WmiParams = @{
            Path = "ROOT\SMS\Site_$($SiteCode):SMS_Collection.CollectionId='$($DCollection.CollectionID)'"
            Name = 'RequestRefresh'
            ComputerName = $SiteServer
            }
        Invoke-WmiMethod @WmiParams
        Write-Verbose "Device Collection '$($DCollection.Name)' refreshed"
        }
    }
}
```


Happy Scripting! 🙂