We've been fielding UPC questions from Sellers ever since Amazon changed their GTIN policy in 2016. What do you do if Amazon tells you your GTIN has already been used? How do you add a GS1 GTIN to an old listing? What if Amazon won't recognize your prefix as matching your brand? We spoke to Michelle Covey of GS1 US to get the best troubleshooting steps for these common issues.
