Added the router but how does the redirect url look? Do you attach the /test at the very end of the url after the host part or does it go directly after the store?

@tomasdelaveau Did you ever find a solution? I'm having the exact same problem as you. Everything work fine up until this step: "View the pages/annotated-layout.js page in your browser by appending annotated-layout to the end of your store’s myshopif...