I have created a UserParameter:

{script}
UserParameter=veeam.test[*],powershell.exe -File C:\Scripts\Test.ps1 "$1"{script}

The Powershell Script is:

{script}
param(
[string]$JobName
)
$JobName{script}

When I run: zabbix_agentd.exe --test veeam.test["1"]
I get the following result: veeam.test[1] [m|ZBX_NOTSUPPORTED]

What causes this problem ?