A LLD rule is in unsupported state with error "Cannot obtain root\webAdministration WMI service."
The error is generated in zabbix sources ("Cannot obtain %s WMI service.", wmi_namespace)
That's the reason why it did not discover items.
You could check what namespaces in WMI/root do you have. Open powershell and execute this command:
gwmi -namespace "root" -class "__Namespace" | Select Name
"webAdministration" entry should be listed there.
If it's missing then make sure that you have these 2 options enabled on the windows machine:
You can find that on Control Panel > Programs and Features > Turn Windows features on or off.
Without those options I had not "webAdministration" entry on my test windows box.
This should be reflected on the solution doc page