ParamForAzFunction.ps1

using namespace System.Net

param($Request, $TriggerMetadata)

$UserPrincipalNameOrObjectId = $Request.Body.UserPrincipalNameOrObjectId

if (-not $UserPrincipalNameOrObjectId) {
    Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
        StatusCode = [HttpStatusCode]::BadRequest
        Body = "ERROR: UserPrincipalNameOrObjectId is required in the request body"
    })
    return
}