Understanding the difference between System.Object[] System.Xml.XmlDocument

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You do not call functions like this. You are basically sending all the arguments as the first parameter. You call them like this

# test function
function Get-Something {
    Param(
        [parameter(ValueFromPipelineByPropertyName)]
        $FirstParam,

        [parameter(ValueFromPipelineByPropertyName)]
        $SecondParam
    )

    process{
        Write-Host FirstParam: $FirstParam SecondParam: $SecondParam
    }
}

preferred to be verbose

# named parameters
Get-Something -firstparam firstarg - secondparam secondarg

next option is positional parameters

# positional parameters
Get-Something firstarg secondarg

Finally the pipeline

# pipeline
[PSCustomObject]@{FirstParam = 'firstarg';SecondParam = 'secondarg'} | Get-Something

All of these output

FirstParam: firstarg SecondParam: secondarg

Now watch when we call it incorrectly with parenthesis

Get-Something ('firstarg', 'secondarg')

FirstParam: firstarg secondarg SecondParam:

Uh oh, both arguments went as the first parameter.