Exchange Powersehll Remote Script

Dear Support,

i have following Problem:

If i exec this Scritp on the powershell of PRTG Server, everything works fine and i get all Values. But if i Run it with a PRTG Sensor ill get an Error, i wonder why the Script is Executed with the Computer Account of PRTG. OF COurse the XXXX are replaced with the Real Adresses and Server Names

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param (
[String]$mailbox="xxxxxxxxx"
)

#Exchange 2010 with current user

$ExchangeOrNLBFQDN = "xxxxxx"
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "http://$ExchangeOrNLBFQDN/PowerShell/?SerializationLevel=Full" -Authentication Kerberos 

Import-PSSession $Session -DisableNameChecking -AllowClobber



# Letzer Monat // Variablen mit -Start & -End können nicht in die Remote Session übergeben werden
$CurrentDate = Get-Date
$LastMonth = (($CurrentDate).AddMonths(-1)).ToUniversalTime().Month
$LastMonthYear = (($CurrentDate).AddMonths(-1)).ToUniversalTime().Year
$LastMonthName = $LastMonth | %{(Get-Culture).DateTimeFormat.GetMonthName($_)}
$LastMonthDays = [DateTime]::DaysInMonth($LastMonthYear, $LastMonth)
$StartOfPrevMonth = Get-Date -Month $LastMonth -Year $LastMonthYear -Day 1 -Hour 0 -Minute 0 -Second 0 
$EndOfPrevMonth = ($StartOfPrevMonth).AddMonths(1).AddTicks(-1)


# Abruf des Messagtrackinglogs
$WeekCS = Get-Messagetrackinglog -Server $ExchangeOrNLBFQDN -Recipients $mailbox -Start $StartOfPrevMonth -End $EndOfPrevMonth -ResultSize unlimited -EventID RECEIVE


$InternWeekCS=$WeekCS| where {($_.Sender -like "*@xxxxxx") -or ($_.Sender -like "*xxxxxxxx")}
$ExternWeekCS=$WeekCS| where {($_.Sender -notlike "*x") -and ($_.Sender -notlike "*xxxxxxxx") } 
$AllWeekCS=$WeekCS

$InternCountWeekCS=$InternWeekCS | measure
$InternSumWeekCS14=$InternCountWeekCS.count

$ExternCountWeekCS=$ExternWeekCS | measure
$ExternSumWeekCS14=$ExternCountWeekCS.count

$AllCountWeekCS=$AllWeekCS | measure
$AllSumWeekCS14=$AllCountWeekCS.count

#$AllSumWeekCS14
#$InternSumWeekCS14
#$ExternSumWeekCS14



#write-host "Sending XML Result to STDOUT"

"<prtg>
	<result>
		<channel>Sendcount2</channel>
		<value>$AllSumWeekCS14</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result>
	<result>
		<channel>Sendcount1</channel>
		<value>$InternSumWeekCS14</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result><result>
		<channel>Sendcount</channel>
		<value>$ExternSumWeekCS14</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result>
	
	
	
</prtg>"

            
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And here is the Result of the Sensor

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New-PSSession : [ixxxxxxxt] Beim Verarbeiten von Daten vom 
Remoteserver "xxxxxxxxxxt" ist folgender Fehler aufgetreten: 
Benutzer "xxxxxx/xxxxx/PRTGServer" ist keiner 
Verwaltungsrolle zugewiesen. Weitere Informationen finden Sie im Hilfethema 
"about_Remote_Troubleshooting".
In C:\Program Files (x86)\PRTG Network Monitor\custom 
sensors\EXEXML\GKS14.ps1:8 Zeichen:12
+ $Session = New-PSSession -ConfigurationName Microsoft.Exchange 
-ConnectionUri "h ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~
    + CategoryInfo          : OpenError: (System.Manageme....RemoteRunspace:Re 
   moteRunspace) [New-PSSession], PSRemotingTransportException
    + FullyQualifiedErrorId : IncorrectProtocolVersion,PSSessionOpenFailed
Import-PSSession : Das Argument fr den Parameter "Session" kann nicht 
berprft werden. Das Argument ist NULL. Geben Sie einen gltigen Wert fr das 
Argument an, und fhren Sie den Befehl erneut aus.
In C:\Program Files (x86)\PRTG Network Monitor\custom 
sensors\EXEXML\GKS14.ps1:10 Zeichen:18
+ Import-PSSession $Session -DisableNameChecking -AllowClobber
+                  ~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Import-PSSession], ParameterBi 
   ndingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationError,Microsoft.Power 
   Shell.Commands.ImportPSSessionCommand
 
Get-Messagetrackinglog : Die Benennung "Get-Messagetrackinglog" wurde nicht 
als Name eines Cmdlet, einer Funktion, einer Skriptdatei oder eines 
ausfhrbaren Programms erkannt. šberprfen Sie die Schreibweise des Namens, 
oder ob der Pfad korrekt ist (sofern enthalten), und wiederholen Sie den 
Vorgang.
In C:\Program Files (x86)\PRTG Network Monitor\custom 
sensors\EXEXML\GKS14.ps1:25 Zeichen:11
+ $WeekCS = Get-Messagetrackinglog -Server $ExchangeOrNLBFQDN -Recipients 
$mailbox ...
+           ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-Messagetrackinglog:String)  
   [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
 
<prtg>
	<result>
		<channel>Sendcount2</channel>
		<value>0</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result>
	<result>
		<channel>Sendcount1</channel>
		<value>0</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result><result>
		<channel>Sendcount</channel>
		<value>0</value>
		<showChart>1</showChart>
		<showTable>1</showTable>
		<unit>Count</unit>
		<customunit>Mails</customunit>
	    <mode>Absolute</mode>
	</result>
	
	
	
</prtg>

exchange powershell remote