Brand new FBA seller here

I’m hoping for someone to explain it like I’m five. Today I went to go ship my package with just the shipping label that Amazon provides at the end of the “send to amazon” process when I went to go ship it and they scanned it they said that they couldn’t find any kinds shipping ID on the box, that the amazon provided one didn’t match to anything, do I need a separate shipping ID from the carrier to add to the box?