Invalid or unrecognized UPC

eBay error 21919326 fires when the UPC value submitted doesn't match a known product or fails check-digit validation. The listing is blocked until the UPC is corrected or marked exempt.

Common causes: leading zeros stripped by Excel turning a 12-digit UPC into 11 digits, the wrong identifier submitted (an MPN or ASIN was put in the UPC field), GTINs from restricted ranges (often retailer-issued), or a typo in the source PIM. eBay validates the check digit and matches against its own catalog database.

1. Validate every UPC with a check-digit tool before submitting.
2. Format the UPC column as Text in Excel to preserve leading zeros.
3. If a product genuinely has no UPC, submit 'Does Not Apply' for the UPC item-specific.
4. Verify the UPC matches the GS1-issued barcode on the physical product, not a third-party reseller code.
5. Resubmit and confirm the listing publishes.

• Using Amazon ASINs in the UPC field
• Re-using one UPC across multiple variants of the same product
• Trusting auto-generated identifiers from a PIM