I use shipment v2 API in playground.

URL of my request: https://playgroundapi.equinix.com/colocations/v2/orders/shipments

JSON data of my request:
{
    "type":"INBOUND",
    "requestedDateTime": "2023-03-02T10:45:41Z",
    "cageId":"1234",
    "details": {
        "carrier":"OTHER",
        "carrierName":"New Carrier",
        "numberOfBoxes":2,
        "carrierTrackingNumbers": [
            "t1Z294AK92654678989",
            "t1Z086DK96424456780"
        ]
    }
}

I get two possible responses for this same request:

• 504 gateway time-out error
  {
      "fault": {
          "faultstring": "Gateway Timeout",
          "detail": {
              "errorcode": "messaging.adaptors.http.flow.GatewayTimeout"
          }
      }
  }
• 204 No Content

However according to API docs, I should get 201 and the order id.