Not Authorized message when submitting POST request

Submitting POST JSON request via Postman works perfectly.  Imported the Postman collection to ReadyAPI but when executing the request, I'm receiving a Not Authorized message.  Sample JSON below.  Seems to be ignoring the auth section.  Any ideas?

POST {service.endpoint}/clients/api HTTP/1.1

Accept-Encoding: gzip,deflate

Content-Type: application/json

Content-Length: 2524

Host: {service.endpoint}

Connection: Keep-Alive

User-Agent: Apache-HttpClient/4.5.2 (Java/15)

{

    "auth" : {

        "user_id"    : "19644",

        "api_key"   : "dbf067d8609igiot8i6troiuvoiuyfuyfg43ea702d"

    },

    "order" : {

        "type"                                        : "New",

        "client_file_number"            : "123456789A",

        "lender"                                     : "Some Bank",

        "loan_amount"                        : "200000",

        "loan_number"                       : "1234-5678-90",

        "full_street_address"            : "123 Main St.",

        "street_number"                    : "123",

        "street_name"                         : "Main St."

}