Amazon Error 8572: How Do I Solve This?

I bought a GTIN last night. Now I’m trying to officially create my listing, using the GTIN. But I keep getting the 8572 error:

“You are using UPCs, EANs, ISBNs, ASINs, or JAN codes that do not match the products you are trying to list. If you believe you have reached this message in error, contact Seller Support with the following information: Product name, Manufacturer name, Brand name, UPC/EAN/ISBN/JAN along with GS1 certificate, etc.”

Does anyone know how I can get around this. My GTIN is official, since I got it form the GS1US website. I’ve gotten around this before with other products, but I can’t remember how I did it. Should I just copy a new template’s listing, and try again from scratch? Should I wait a few days for my GTIN to become official?