2. Reprint or regenerate the barcode: Make sure that one barcode is really missing, and that you can reprint or regenerate the correct barcode, and make sure to use the appropriate barcode generation tool or software.
3. Contact the supplier or manufacturer: the purchased product has a defective barcode, contact the supplier or manufacturer to explain the problem and ask for the correct barcode.
4. Update Amazon list: If the product is sold on Amazon and the wrong barcode is used, you can update the product list. When editing product information, please correct the barcode and submit the update to ensure correct identification and clear product identification.