a couple of weeks ago I activated amazon FBA drop shipping in Shopify, added the amazon SKUs to the products and selected amazon as shipping methods. At that point, fulfillment by amazon worked.
Now, it amazon fulfillment for my shopify orders does not work anymore. I get the following error messages:
Fulfillment of 1 item via Amazon Marketplace Web failed.
AuthToken is not valid for SellerId and AWSAccountId.
Do you know how I can fix this?
I already reached out to shopify help chat, but the support employee did not know how to solve this.