You connect a new fulfillment tool or inventory tracker to your Shopify store and it immediately throws errors. Some orders fail to sync, or stock levels stay stuck at zero even after you receive a new shipment. The system flags that your variants are missing SKUs.

Source: [Dev.to](https://dev.to/watershow/how-to-bulk-update-missing-skus-for-existing-shopify-products-1lnj)

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