B2B Sales Order lines are Shipped but still showing Awaiting Shipping with error

Summary:

B2B Sales Order lines are already shipped but still showing Awaiting Shipping with below error:

The fulfillment line couldn't be updated because the line isn't ready to process the response from the fulfillment system. Details: A wide range of issues might cause this problem, such as the line isn't on a wait step, the line is locked, there's a problem with the data, and so on. To fix it, go to the Scheduled Processes work area and run the Process Responses from Order Fulfillment scheduled process. Set the Task Type parameter to the Shipment task type, and set the From Load Request and the To Load Request parameters to the 5599261 identifier when you run