Why is my supplier feed not updating stock correctly, and how do I fix identifier mismatches?

Stock Sync requires an exact match between your store’s product identifiers and the data in your supplier’s feed. If identifiers do not align, Stock Sync will skip affected variants and leave their stock unchanged.

Common causes include:

• Variant options positioned differently (e.g., sizes in Option 1 instead of Option 2) when using Handle + Option mapping.
• Missing or mismatched SKUs when trying to use SKU as the product identifier.

If only some products use a different option structure, create a second update feed configured to match those variants (for example, mapping sizes from Option 1 instead of Option 2). This avoids breaking products that already work with the first feed.

You cannot use SKU as the identifier if the supplier’s SKUs are blank or different from your store’s, because Stock Sync requires exact matches on both sides.

Creating a dedicated secondary feed for differently structured products ensures all variants sync correctly without affecting the rest of your catalog.

Updated on: 09/07/2026