Amazon error 6024: Product ID (UPC/EAN/GTIN) is not validThe external_product_id fails a checksum or length test, or does not match the declared external_product_id_type. Very often the real cause is Excel stripping a leading zero or converting a 13-digit number to scientific notation.How to fix error 6024

Format the identifier column as Text before pasting, then re-enter the code so leading zeros survive.

Check the length: UPC = 12 digits, EAN = 13, ISBN-13 = 13, ASIN = 10 alphanumeric.

Verify the final check digit with a GTIN calculator before uploading.

Make sure external_product_id_type matches what you supplied (UPC, EAN, GTIN, ASIN).

Only use barcodes issued to you by GS1 - recycled or resold codes are rejected and can trigger account review.

All Amazon flat-file error codes