Hi @rvdp88 , it is not the case that for auto language redirection to work all fields in Translate & Adapt need to be filled in. Language redirection is independent of Translate & Adapt. Check all conditions at the bottom of the page here are met and you should be fine: https://help.shopify.com/en/manual/markets/automatic-redirection
It’s based on browser language. But if the user has previously used the site in a different language that gets stored as a cookie, so try in an incognito browser to test.