How can I resolve the GTIN MPN error on my Google sales channel?

Technical Q&A

Topic summary

Main issue: Products from Zendrop/CJdropshipping fail Google Merchant Center checks for missing identifiers (GTIN/MPN). The merchant can’t get GTINs from suppliers and needs to configure product identifiers in Shopify/Google.

Guidance provided:

  • If a manufacturer assigned a barcode (GTIN), supply GTIN and brand, and set identifier_exists to “yes.”
  • If no barcode exists, remove brand/MPN/GTIN and set identifier_exists to “no,” or mark products as custom.
  • Implement via Shopify product metafields or at product level (More actions > Google), or use Google feed rules. Help center articles and a video tutorial were shared.

Latest development: After applying rules, the merchant sees “Incorrect value: identifier exists (US visibility limited).” Google indicates a recognized identifier exists; the feed was set to False. To resolve, provide a valid GTIN and set identifier_exists to True, or remove the attribute if truly no identifier.

Status: Not fully resolved. Next steps depend on confirming whether products have GTINs: either obtain GTINs from the supplier/manufacturer and set “yes,” or remove identifiers and set “no” only if no GTIN exists.

Summarized with AI on January 18. AI used: gpt-5.
6

The rule is as followed

  1. If a manufacturer has assigned a barcode then you are required to add this info in the GTIN field. Alongside the brand value with identifier exists to yes.

  2. If the manufacturer has not assigned a barcode, then remove the values brand, mpn and gtin and set identifier exists to no.

Here is a guide how to apply the rules using feed rules: https://support.google.com/google-ads/community-video/216954171

More info:
https://support.google.com/merchants/answer/6324351
https://support.google.com/merchants/answer/6324461
https://support.google.com/merchants/answer/6324482
https://support.google.com/merchants/answer/6324478