TI-API: Customer needs help, Testing of order response is providing incorrect PO #

Tool/software:

On Jun 17^th 2024,  Create API request has stopped sending Order number created and we are not able to proceed with UAT. It is going to cause delay in going to production. Your urgent intervention needed. Why this issue happened? Please treat this as urgent for customer feedback ASAP. Customer BCC on this request.

And in the response we stopped receiving order number

{

  "orders" : [

    {

      "orderDate" : "2024-06-17 10:30:51",

      "customerPurchaseOrderNumber" : "SG240364",

      "orderStatus" : "PENDING",

      "shipToAccountNumber" : "OMITTED",

      "customerPurchaseOrderDate" : "#",

      "lineItems" : [
....