Powershell script returning no result for PRTG

I have a PS Script where I am trying to return data for status from Horizon pools. I get data when I run the script in the ISE window, but when running from PRTG in the sensor log I only get <prtg> </prtg? returned. The modules are all located within the powershell directories (I ran across another post), but still no dice. Any ideas?

Here is the script:

param (
    [string]$HVServer="",
    [string]$HVUser="",
    [string]$HVPass="",
    [string]$HVPoolID = ""
)

if ($HVPoolID -ne "")
{
    Import-Module VMware.VimAutomation.Core
    Import-Module VMware.VimAutomation.HorizonView
    if ($HVUser -eq "" -or $HVPass -eq "") { $con = Connect-HVServer -Server $HVServer  }
    else { $con = Connect-HVServer -Server $HVServer -User $HVUser -Password $HVPass }
    $viewAPI = $con.ExtensionData
    $query_Service = New-Object "Vmware.Hv.QueryServiceService"
    $query = New-Object "Vmware.Hv.QueryDefinition"
    $query.QueryEntityType = 'DesktopSummaryView'
    $Pools = $query_Service.QueryService_Query($viewAPI,$query)
    write-host "<prtg>"
    foreach($dp in $Pools.Results)
    {
        if ($dp.DesktopSummaryData.Name -eq $HVPoolID)
        {
            if ($dp.DesktopSummaryData.Type -ne "RDS")
            # no usage calculation for RDS types
            {
                $usage = $dp.DesktopSummaryData.NumSessions / $dp.DesktopSummaryData.NumMachines * 100
                write-host "  <result>"
                write-host "    <channel>Usage</channel>"
                write-host "    <value>$usage</value>"
                write-host "    <unit>percent</unit>"
                write-host "    <float>1</float>"
                write-host "    <DecimalMode>Auto</DecimalMode>"
                write-host "    <limitMode>1</limitMode>"
                write-host "    <LimitMaxWarning>85</LimitMaxWarning>"
                write-host "    <LimitMaxError>95</LimitMaxError>"
                write-host "  </result>"
            }
                        
            write-host "  <result>"
            write-host "    <channel>$($dp.DesktopSummaryData.Name) Sessions</channel>"
            write-host "    <value>$($dp.DesktopSummaryData.NumSessions)</value>"
            write-host "    <unit>count</unit>"
            write-host "  </result>"

            write-host "  <result>"
            write-host "    <channel>$($dp.DesktopSummaryData.Name) Machines</channel>"
            write-host "    <value>$($dp.DesktopSummaryData.NumMachines)</value>"
            write-host "    <unit>count</unit>"
            write-host "  </result>"

            write-host "  <result>"
            write-host "    <channel>Desktop Enabled</channel>"
            if ($dp.DesktopSummaryData.Enabled) {write-host "    <value>1</value>"} else{write-host "    <value>2</value>"}
            write-host "    <unit>Custom</unit>"
            write-host "    <ValueLookup>prtg.standardlookups.yesno.stateyesok</ValueLookup>"
            write-host "  </result>"

            if ($dp.DesktopSummaryData.Type -ne "RDS")
            # Provisioning is disabled for RDS type
            {
                write-host "  <result>"
                write-host "    <channel>Provisioning Enabled</channel>"
                if ($dp.DesktopSummaryData.ProvisioningEnabled) {write-host "    <value>1</value>"} else{write-host "    <value>2</value>"}
                write-host "    <unit>Custom</unit>"
                write-host "    <ValueLookup>prtg.standardlookups.yesno.stateyesok</ValueLookup>"
                write-host "  </result>"
            }

            if ($dp.DesktopSummaryData.Type -eq "RDS")
            {
                # match RDS Id with RDSServerSummaryView to get status of RDS servers in farm
                # used to detect if RDS server agent unreachable status
                $query_Service2 = New-Object "Vmware.Hv.QueryServiceService"
                $query2 = New-Object "Vmware.Hv.QueryDefinition"
                $query2.QueryEntityType = 'RDSServerSummaryView'
                $filter2 = new-object VMware.Hv.QueryFilterEquals -Property @{'memberName' = 'base.desktop'; 'value' = $dp.Id}
                $query2.Filter=$filter2
                
                $Farms = $query_Service2.QueryService_Query($viewAPI,$query2)
                
                write-host "  <result>"
                write-host "    <channel>Status</channel>"
                if ($Farms.Results[0].RuntimeData.Status -eq "AVAILABLE") {write-host "    <value>1</value>"}
                else { write-host "    <value>0</value>"}
                write-host "    <unit>Custom</unit>"
                write-host "    <ValueLookup>prtg.standardlookups.offon.stateonok</ValueLookup>"
                write-host "  </result>"
            }
        }
    }
    write-host "</prtg>"

    # disconnect from our connection server
    $con | Disconnect-HVServer -Force -Confirm:$false
}