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Read onlyHi @Seller_aU4mUabuAXuwH,
Dominic from Amazon here, happy to help. The most common reason why this error message occurs is due to the listing being incomplete (whether it has not fully generated in our system or vital information is missing when listing the product). We posted about this error in detail here: Listing Lounge: Addressing the 'SKU for this product is unknown or cannot be found' Error Message
Best,
Dominic