Create a shipment - 202 response

We were told last week that the 202 response we were getting was because we were using the sandbox. We are using the production key and still getting 202 responses.

Can you review this shipment id and tell us what we are doing wrong:

"easyship_shipment_id": "ESUS175182037",

We would love to pay for this service but can't get it to work!

Please help!