Access Key ID Issue with US marketplace

When I click on US (my default marketplace) I can’t access products anymore. Following text appears: “Your AWS Access Key Id is not registered as an Amazon Associate. Please verify that you are registered as an Amazon Associate in respective locale and you added the email address registered for the Product Advertising API as a secondary email address in your Amazon Associates account.” I have just one registered email address for all the markets and my registration for the US is active (I logged in as an associate to check). All other marketplaces work just fine and I didn’t change anything.

The page I need help with: [log in to see the link]