Create an account during checkout isn’t working

Hey!

We want to enable a customer the chance to create an account during checkout. We’ve already used it in previous versions on woocommerce by ticking de option ” Allow customers to create an account during checkout” and it’s right now enabled, but in the checkout, we don’t see the select box for this option.

We have disabled all plugins and switched to the Twenty Twenty theme, still not working.

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