How to get Request ID in email script

How to get Request ID in email script

param (
    $json = $(throw "-json is required.")
)
$jsonContent = Get-Content $json -Encoding UTF8
$jsonContent = ConvertFrom-Json -InputObject $jsonContent

$request = $jsonContent.request
$request.id = $jsonContent.request.WORKORDERID

in MessageBody i have "blablabla $request.id" and it's not working. 


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