Pre-poppulate fields in Shopping Cart

I found this article https://help.infusionsoft.com/related-articles/available-url-parameters-for-the-shopping-cart, but I can’t make it work
if I have a link https://ab123.infusionsoft.com/app/manageCart/addProduct?productId=24, in theory, I should change it to https://ab123.infusionsoft.com/app/manageCart/addProduct?productId=24&inf_field_Email=mail@example.com, right? but it’s not working
can someone explain how to make it work?

it works when I add products as a bundle, but not with single products