WebContent "Contents": How do you get this to work?

Request Body

{"clientName": "TI","resource": "Staff"}

In my Power BI Dataflow, I'm trying to call this API just the same using WebContent. But it doesn't work. The Azure API never gets hit. When I first created the Power Query WebContents, I accidently left out the Content, and it does hit the Azure API. Although, the Web Function will just return a BadRequest because it requires a Body (Content). However, every attempt I've made to include the Content yields the same result - it doesn't hit the API. There's no way to know why. There's no feedback in Power BI to diagnose what the problem is. I've tried many different header types, formatting, with/without Host and Content-Length, Cache-Control and and even Postman-Token. Any suggestions would be appreciated.

let
  // Define the request body
  requestBody = Json.FromValue([
    clientName = ParameterClientName,
    resource = "Staff"
  ]),
  requestBodyText = Text.FromBinary(requestBody),
  baseUrl = ParameterConnectorAzureUrl,
  azureXCode = ParameterConnectorAzureXCode,
  host = "tiwlfunctions.azurewebsites.net",
  contentLen = Text.Length(requestBodyText),
  // Define the request headers
  headers = [
    #"Content-Type"="application/json",
    #"x-functions-key"=azureXCode,
    Host=host,
    #"Content-Length"=contentLen
  ],
  binContent = Text.ToBinary(requestBody),
  xbinContent = Text.FromBinary(binContent),
  dataRequest = Web.Contents(baseUrl, [
    Headers=headers,
    Content=Text.ToBinary(requestBodyText),
    RelativePath = "api/tiwlConnector",
    Query = null
  ])
in
  dataRequest