eBay returns such an error when a product is initially listed using eBay API based on the Item SKU, whereas M2E Pro—eBay integration is set to work via eBay API based on the Item ID.
So, the issue arises because of the API conflict. When you try to perform actions for your products via M2E Pro, the eBay API does not validate the Item ID as the products were Listed based on SKU.
To resolve the error, please apply the List action to the product but not the Relist or Revise action.
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