Corresponds to: "The item has a new FNSKU and can no longer be posted under the existing one".

The FNSKU has changed from the respective unit. For this reason, the old one can no longer be used.

Try to send the SKU manually.

This should be create another error:

"Merchant SKU already exists Merchant SKUs cannot be reused, even if a previous listing with the SKU has been deleted. Use a new SKU to create this quote."

Then take a screenshot of the error and send it to Amazon (and also to us).

Such errors are usually related to the fact that something went wrong in the Amazon database or during the listing upload.

It's the best to contact the Amazon Seller Support.

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