PowerShell脚本无法从Windows Task Scheduler中正常运行

概述：我有一个脚本，用于通过WMI查询SCCM中的新应用程序请求。在PowerShell控制台中手动启动脚本时，脚本可以完美运行（无论提升与否，无关紧要）。我需要通过任务计划程序运行脚本。当前设置为使用管理员凭据运行，并且选中了“以最高特权运行”复选框。

问题：无法从Windows Server 2008 R2中的任务计划程序正确运行。未报告任何错误（任务调度程序返回错误代码0），但似乎未越过以下行：

$GetAppRequest = Get-WmiObject -Class SMS_UserApplicationRequest -Namespace root/SMS/site_$SiteCode | Where-Object {$_.CurrentState -like "1"} | ForEach-Object {

这是完整的脚本：

#Hard-coded variables
$SiteCode = "MySiteCode"
$ComputerName = "My-SCCM-Server"
$GUIDFilePath = "C:\Scripts\SCCM\GUIDList.txt"
$FilePath = "C:\Scripts\SCCM"
$smtpServers = "smtp1.domainname.com","smtp2.domainname.com"
$reliableSmtpServer = $null
$logpath = "C:\Scripts\SCCM\RequestLog.txt"

#logging functionality
function log($message, $type){
  $date = get-date
  $string = "$date $type : $message" | Out-File $logpath -Append
}

#does log exist?
if (gi -Path $logpath -ErrorAction SilentlyContinue){
  #yep, the log exists!
  $logContent = cat $logpath
  log -message "Script called and log opened for writing." -type "Info"
} else {
  #nope, the log doesn't exist, let's make one.
  write "Can't find log file, creating a new one."
  $newFileResult = New-Item -Path $logpath -ItemType File -ErrorAction Stop
  if ($newFileResult.Exists){
    log -message "new log file created" -type "Info"
  } #end if
} #end else

#Email variables
$from = "[email protected]"
$to = "[email protected]"
$subject = "New SCCM Application Approval Requests"

#Determine which SMTP to use.
$smtpServers | ForEach-Object {
  if ($reliableSmtpServer -eq $null){
    if (Test-Connection -ComputerName $_ -ErrorAction SilentlyContinue){
      write "Reliable SMTP server found: $_"
      $reliableSmtpServer = $_       
    } #end if test-connection
  } #end if reliableSmtpServer exists
} #end foreach SMTP server

if ($reliableSmtpServer){
  log -message "Reliable SMTP server found, $reliableSmtpServer" -type "Info"
} else {
  log -message "No reliable SMTP server could be found" -type "Error"
}

#Get the entries from GUIDList.txt
if ($GetGUID = Get-Content -Path $GUIDFilePath -ErrorVariable guidReadError {
  write "Successfully read $GUIDFilePath"
  log -message "Successfully read $GUIDFilePath" -type "Info"
} else {
  Write-Error -Message "Couldn't read GUIDfile..."
  log -message "Failed to read GUIDFile" -type "Error"
}

#Get all Application Requests with a CurrentState of "1"
log -message 'Attempting to get all Application Requests with a CurrentState of 1' -type "Info"
$GetAppRequest = Get-WmiObject -Class SMS_UserApplicationRequest -Namespace root/SMS/site_$SiteCode | Where-Object {$_.CurrentState -like "1"} | ForEach-Object {
  log -message "App found, $_.Application" -type "Info"
  if ($GetGUID -contains $_.RequestGuid) {
    Write-Host "Application request $($_.RequestGuid) already present"
    log -message "Application request $($_.RequestGuid) already present" -type "Info"
  } else {
    $appUser = $_.User
    $appName = $_.Application
    $appComment = $_.Comments
    $Body = @"
    Application request: $appName
    User: $appUser

    Comment: $appComment
    "@ #This row can't contain any blank spaces or tabs

    log -message "New record found: $appUser, $appName, $appComment" -type "Info"

   #Email configuration
    Send-MailMessage -SmtpServer $reliableSmtpServer -From $from -To $to -Subject $subject -Body $body -ErrorVariable mailError
   if (!($mailError)){
     write "Message successfully sent to : $to"
     log -message "Message successfully sent to : $to" -type "Info"
   } else {
     Write-Error -message "Failed to send email!"
     log -message "Failed to send email!" -type "Error"
   } #end else

   #Append the current objects GUID to GUIDList.txt
   Write "Appending $($_.RequestGUID) to $GUIDFilePath"
   log -message "Appending $($_.RequestGUID) to $GUIDFilePath" -type "Info"
$_.RequestGuid | Out-File $GUIDFilePath -Append

  } #end else statement
} #end forEach

#Remove the GUIDList.txt file and re-create it when there's more than 100 entries
$GUIDCount = $GetGUID.Count
if ($GUIDCount -gt 100) {
  log -message "Greater than 100 GUID entries, clearing list." -type "Info"
  Get-Item $GUIDFilePath | Remove-Item
  New-Item -Path $FilePath -Name GUIDList.txt -ItemType file
}

#Create a new log once the log file exceeds 1000 lines.
$logCount = $logContent.Count
if ($logCount -gt 1000) {
  log -message "Log file is too long, removing log" -type "Warning"
  Remove-Item $logpath
}

这是预定的任务XML：

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.3" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2014-05-09T17:10:48.6636926</Date>
    <Author>domainname\myUserAccount</Author>
    <Description>Runs a script located at C:\scripts\SCCM to determine if there are any new application requests and notify IT staff via Email.</Description>
  </RegistrationInfo>
  <Triggers>
    <TimeTrigger>
      <Repetition>
        <Interval>PT15M</Interval>
        <StopAtDurationEnd>false</StopAtDurationEnd>
      </Repetition>
      <StartBoundary>2014-05-09T17:12:04</StartBoundary>
      <ExecutionTimeLimit>PT1H</ExecutionTimeLimit>
      <Enabled>true</Enabled>
    </TimeTrigger>
  </Triggers>
  <Principals>
    <Principal id="Author">
      <UserId>domain\AdminAccount</UserId>
      <LogonType>Password</LogonType>
      <RunLevel>HighestAvailable</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
    <AllowHardTerminate>true</AllowHardTerminate>
    <StartWhenAvailable>false</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>true</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
    <UseUnifiedSchedulingEngine>false</UseUnifiedSchedulingEngine>
    <WakeToRun>false</WakeToRun>
    <ExecutionTimeLimit>P3D</ExecutionTimeLimit>
    <Priority>7</Priority>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>powershell.exe</Command>
      <Arguments>-noprofile -file "C:\scripts\sccm\Notify.ps1"</Arguments>
    </Exec>
  </Actions>
</Task>