We're using service discovery on Windows 2008 machines. That works but error messages are showing up for the discovery rule.

The discovery mechanism is not updating the items frequently so we see a relation to the reported problem:

This is the complete error message:

Cannot create item: item with the same key "wmi.get["root\cimv2","SELECT StartMode FROM Win32_Service WHERE Name like '{#INESSERVICENAME}'"]" already exists

These are the config snippets:

UserParameter=service.discovery,powershell -File "C:\Program Files\zabbix\service_discovery.ps1"

Please find attached the powershell script as well as an example script output.