Invoke-WebRequest hangs inside of Activity Function about azure-functions-durable-powershell HOT 1 OPEN

function Get-APIResource {
    param(
        [Parameter (Mandatory=$true)]$Resource,
        [Parameter (Mandatory=$true)]$SearchQuery
    )

    $BaseURL = ""

    $httpClient = New-Object System.Net.Http.HttpClient
    $httpClient.DefaultRequestHeaders.Add("ApiCode", $env:ApiCode)
    $httpClient.DefaultRequestHeaders.Add("UserName", $env:APIUser)
    $httpClient.DefaultRequestHeaders.Add("APIKey", $env:APIKey)

    $ResourceURL = $BaseURL + $Resource + '/query?search=' + $SearchQuery

    $i = 1

    try {

        do {

            Write-Warning "Getting page $i of $Resource"
            $responseStream = $httpClient.GetStreamAsync($ResourceURL).Result
            $streamReader = [System.IO.StreamReader]::new($responseStream)
            $responseContent = $streamReader.ReadToEnd()
            $Response = $ResponseContent | ConvertFrom-Json
            
            If ($Response.items){

                Write-Warning "($i) Retrieved $($Response.items.count) items"

                $Response.items | ForEach-Object{
                    $_
                    #$ReturnList.Add($_)
                }
            }
    
            If ($Response.item){

                Write-Warning "($i) Retrieved $($Response.item.count) ITEM"

                $Response.item | ForEach-Object{
                    $_
                    #$ReturnList.Add($_)
                }
            }
    
            $ResourceURL = $Response.pagedetails.nextPageUrl

            If ($null -eq $ResourceURL){
                Write-Warning "($i) ResourceURL is null"
            } Else {
                Write-Warning "($i) Next page URL: $ResourceURL"
            }

            $i++

        } while ($null -ne $ResourceURL)

    }
    catch {
        Write-Error "Connecting to API Failed."
        throw "API Error: $($_.Exception.Message)"    
    }

}