When you go to fetch your Seller ID and MWS Authorisation Token, you will see the following screen:

Try to ensure that you:

  • Correctly copy and paste the Seller ID AND NOT the Marketplace ID.
  • Correctly copy and paste the MWS Authoritisation Token alphanumeric identifier beginning with "amzn.mws."
  • Be sure to copy/paste and not write it down manually. When writing and you are more likely to make a mistake.

If none of the above helps, be sure to visit Amazon MWS Support (https://sellercentral.amazon.co.uk/gp/mws/contactus.html?ref=ag_xx_shel_xx) to see if there is a problem with your Amazon MWS Permissions Manager. 

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