@Ross Lumby, Thanks for posting in Q&A. Based on my test, the Graph API cannot by query via the URL we set. But we can query the information via the following code:
connect-mgGraph
$ManagedDevices = Get-MgBetaDeviceManagementManagedDevice -Filter "Operatingsystem eq 'Windows'"
write-Host "The device Operating System Language information"
Foreach ($ManagedDevice in $ManagedDevices){
$hardware=(Get-MgBetaDeviceManagementManagedDevice -ManagedDeviceId $ManagedDevice.id -Property hardwareinformation).HardwareInformation
$hardwareinfo=$hardware.OperatingSystemLanguage
write-Host $ManagedDevice.DeviceName $ManagedDevice.id,$hardwareinfo
}
Hope the above information can help.
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