Expected behavior

When the Message Results API doses a post task results it should post the message_result array like in the example the documentation.
POST http://localhost/sms/index.php?task=result

{
    "message_result": [
        {
            "uuid": "052bf515-ef6b-f424-c4ee",
            "sent_result_code": 0,
            "sent_result_message": "SMSSync Message Sent"
            "delivered_result_code": -1,
            "delivered_result_message": ""
        }
}

Actual behavior

The message_results array always comes back empty.

{
    "message_result": []
}

Steps to reproduce the behavior

Per the documentation we are sending "message_uuids" through the GET task=result. It response to the API with something like this:

{
  "message_uuids": [
     "3a9ec5f2-6fa4-4f8b-b063-2d7e5267dd08"
  ]
}

However, the POST task=results always sends back an empty array. Like this:

{
    "message_result": []
}

Any help would be greatly appreciated. We have tried everything we can think of and are out of ideas on why the delivery report does not seem be working.