E-Mail Header via Powershell auslesen

Exception calling "FindItems" with "2" argument(s): "The Url property on the ExchangeService object must be set."  
+     $findResults = $service.FindItems([Microsoft.Exchange.WebServices.Data.WellK ...

    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ServiceLocalException

$MailboxSMTP = "xxx@xxx.de"	  
$Username    = "xxx@xxx.de"				  
$Domain      = "xxx"				  
$Password    = "xxxxx"    
		
$ServiceURL  = "https://outlook.office.de/EWS/Exchange.asmx"  

$dllpath = "C:\Program Files\Microsoft\Exchange\Web Services\2.2\Microsoft.Exchange.WebServices.dll"  

[void][Reflection.Assembly]::LoadFile($dllpath) 

$service = new-object Microsoft.Exchange.WebServices.Data.ExchangeService 	

$pagesize = 100 

$offset = 0 
$propertySet=new-object Microsoft.Exchange.WebServices.Data.PropertySet([Microsoft.Exchange.WebServices.Data.ItemSchema]::InternetMessageHeaders) 

do 
{ 
    $view = New-Object Microsoft.Exchange.WebServices.Data.ItemView($pagesize,$offset) 
    $findResults = $service.FindItems([Microsoft.Exchange.WebServices.Data.WellKnownFolderName]::Inbox,$view) 
    foreach ($item in $findResults.Items) 
    { 
        "From: $($item.From.Name)"   
        "Subject: $($item.Subject)"   
        "References: $($item.References)"   
        "InternetMessageID: $($item.InternetMessageID)"   
        "InternetMessageHeaders"   

        $item.Load($propertySet) 

        $item.InternetMessageHeaders|foreach{"$($_.Name): $($_.Value)"}   
        ""   
    
    } 
    $offset+=$pagesize 
} while ($findResults.MoreAvailable) # Do/While loop will continue when more results are available