How do I obtain an ASN?

Thank you both for your assistance, ASN is an Advanced Shipment Notification required for a pallet delivery to be checked in at an Amazon Fulfillment Center.

In the “CARRIER CENTRAL - CARRIER APPOINTMENT REQUEST PORTAL User Guide for Carriers/Vendors/Sellers”

2.1. What is an ASN?
Amazon suppliers provide the Bill Of Lading (BOL) reference of the ASN to their carrier to enable them to book for a delivery slot. Advanced Shipment Notification (ASN) is an electronic packing list that Amazon Suppliers send to Amazon in advance of any delivery, either via Electronic Data Interchange (EDI) or through the “Shipment” functionality of Vendor Central Portal.
An ASN consolidates detailed information about the products and quantities that suppliers intend to
deliver to one of our Fulfilment Centers (FCs) on one single occasion. It can be edited 7 days after creation. An ASN is required on every occasion a supplier ships products to one of our Warehouses. This notification of incoming freight is required for the booking process in CARP.
Vendors can find additional information regarding ASN Creation in the “Shipment section” of Vendor
Central help pages or in the Vendor Manual downloadable from the Resource Center of Vendor Central. Please ensure that the paperwork accompanying the shipment matches exactly with what is on the physical consignment to avoid rejections/refusals at the FC. In particular, the BOL references should be visible on the delivery note.
NB: If you are a seller, Amazon is responsible for generating the ASN."

As the final phase states: “Amazon is responsible for generating the ASN” I have been in contact with Seller Support inquiring as to how to obtain an ASN but nobody has directed me to how I can be issued one as yet.