Powershell - Verwendung von PSSession erzeugt Fehlermeldung

. ((get-itemproperty HKLM:\SOFTWARE\Microsoft\ExchangeServer\v15\Setup).MsiInstallPath + "bin\RemoteExchange.ps1")  
Connect-ExchangeServer -auto

$groups = Get-DynamicDistributionGroup | select DisplayName, LdapRecipientFilter, RecipientContainer, Notes

foreach ($group in $groups) {

    [string] $members = ""  

    $objContainer ="LDAP://" + $group.RecipientContainer.DistinguishedName  
    $objDomain = New-Object System.DirectoryServices.DirectoryEntry $objContainer
    $strFilter = $group.LdapRecipientFilter

    $objSearcher = New-Object System.DirectoryServices.DirectorySearcher
    $objSearcher.SearchRoot = $objDomain
    $objSearcher.Filter = $strFilter
    $objSearcher.SearchScope = "Subtree"  
    $objSearcher.PropertiesToLoad.Add("Name") | Out-Null  
    $objSearcher.Sort.PropertyName = "Name"  

    $colResults = $objSearcher.FindAll()
...
}

$ExchangePsSessionId = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "http://$ExchangeFqdn/powershell" -Authentication Kerberos  
Import-PSSession $ExchangePsSessionId -DisableNameChecking -AllowClobber | out-null

Ausnahme beim Aufrufen von "FindAll" mit 0 Argument(en):  "Unbekannter Fehler (0x80005000)"  
In C:\x\y\z.ps1:77 Zeichen:5
+     $colResults = $objSearcher.FindAll()
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) , MethodInvocationException
    + FullyQualifiedErrorId : COMException