title: Discovery Script is not working
body: <p>Below is my script with identifiers scrubbed. The Base Class for Diagnostics is MyCompany.MyApp and the base class of that is Windows Computer. If I run this on the target machine directly with parameters I am getting XML returned. If I run from my PC it is blank. That makes sense locally, but I thought when you run discoveries that the agent runs it on the machine you are targeting? All my other discoveries thus far have been registry so it is possible I am doing something completely wrong.</p>
  
  <pre><code>Param($sourceId, $managedEntityId, $ComputerName)
  
  $api = New-Object -ComObject 'MOM.ScriptAPI'
  $discoveryData = $api.CreateDiscoveryData(0, $SourceId, $ManagedEntityId)
  
  $Diagnostics = Invoke-Command -ComputerName $ComputerName {
      Get-WebApplication -Name "diagnostics"
  }
  
  foreach ($x in $Diagnostics)
  {
      $instance = $discoveryData.CreateClassInstance("$MPElement[Name='MyCompany.MyApp.Diagnostics']$")
      $instance.AddProperty("$MPElement[Name='Windows!Microsoft.Windows.Computer']/PrincipalName$", $ComputerName)
      $discoveryData.AddInstance($instance)
  }
  </code></pre>