It is possible that the product was not created beforehand due to the 2 levels of verification Otto is applying before products and offers approvals:
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The first level is technical. OTTO checks that API calls are correct.
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The second level concerns the content of the values sent: Compliance of images, etc.
In this case, if you have the error "SKU is unknown", it means that the product is not created yet, and the offer can't be related to this missing SKU.Â