TI-API: TI-API: Need help authenticating to Backlog Sandbox

Dear Support Team, Can you please tell me the cause of the error?

api-portal.ti.com/.../backlog-order-api

Servers:   https://transact-pre.ti.com/v2 - External Pre-Production API Gateway

I am using the ID and secret of the Backlog API, and the shiptoaccountnumber that was notified.

{
  "fault": {
    "faultstring": "Invalid API call as no apiproduct match found",
    "detail": {
      "errorcode": "keymanagement.service.InvalidAPICallAsNoApiProductMatchFound"
    }
  }
}