Cannot run Hyper-V cmdlets from custom script

Hello

I created a custom PowerShell script to use with the Custom EXE/Script type of sensor, but I am not able to get results from it because it says it cannot find the "Get-VM" module. I have installed WMF 5.0 in the Windows Server 2012 R2 running the PRTG probe, AND installed Hyper-V Powershell management tools. When I run the script directly from the PRTG probe in a PowerShell ISE window, the script does what it needs. It uses the Get-VM module.

But when the PRTG sensor tries to use the script, the logs notes this:

Get-VM : The term 'Get-VM' is not recognized as the name of a cmdlet, 
function, script file, or operable program. Check the spelling of the name, or 
if a path was included, verify that the path is correct and try again.
At C:\Program Files (x86)\PRTG Network Monitor\custom 
sensors\EXE\checkAllDCsTimeSyncSvcs.ps1:5 char:22
+ $domaincontrollers = Get-VM -ComputerName $hypervhost | where {$_.Nam ...
+ ~~~~~~
+ CategoryInfo : ObjectNotFound: (Get-VM:String) [], CommandNotFo 
undException
+ FullyQualifiedErrorId : CommandNotFoundException

This doesn't make sense to me, because I have all the necessary tools. Is there a way in PRTG to make it see the latest WMF / PowerShell version ?

Thank you!

param (
[string]$hypervhost
)

$domaincontrollers = Get-VM -ComputerName $hypervhost | where {$_.Name -like 'DC*' -or $_.Name -like 'REPLICA DC*'} | ForEach-Object {$_.Name}
foreach ($domaincontroller in $domaincontrollers) {
   $dcscount += Get-VMIntegrationService -ComputerName $hypervhost -VMName $domaincontroller | where {$_.Name -eq "Time Synchronization" -and $_.Enabled -eq 1} | select VMName,Name,Enabled | Measure-Object | Select-Object -ExpandProperty Count
}

$dcstotal = $dcscount+":OK"

Write-Host $dcstotal

exit 0