Is FNSKU needed in this case?

I’m going to sell a 3-pack of an item which is vacuumed sealed and will stick my UPC code to it. Do I also need an FNSKU or is the UPC enough? PL with our own brand, FBA but also Walmart.

When creating your shipment, you will see whether Amazon allows you to use just the manufacturer barcode or if an FNSKU is required.