Once you create a fulfillment for Amazon, you only have a limited amount of time before you will be able to cancel the fulfillment request successfully. This is much like placing a normal order on Amazon; the speed with which they promise their fulfillment and shipping services requires a very small window for cancellation.
That being said, if you need to cancel your fulfillment request, simply find the specific fulfillment in the Shipments tab on the Fulfillment section. Then, click the Cancel Fulfillment button.
The order will then go into a "Pending Cancellation" status until Amazon confirms that they were able to successfully cancel the fulfillment. If the order is successfully cancelled, it will move back into the Awaiting Shipment status.
Have more questions? Submit a request