Trouble adding Product to a PO?

Check your listed "Vendors" within the Product! 

Click into the Product and scroll almost to the bottom to "Vendors":

There ^^ you will see all the Vendors associated with your Product. Here is also where you can add multiple vendors for a product if needed.

Using your brand's name as a Vendor is totally fine! ShipHero wants to match the Vendor that you listed in the PO with the products associated.

Want to add a Vendor? Follow along with THIS knowledge base article.