Checkout checkbox not displaying

Hi there,

I’m trying to add an opt-in checkbox to my checkout form but it is not displaying on the checkout form. I’ve tried moving it to a few positions, etc, but it won’t show. I’m using a custom child theme of storefront but have not altered the checkout process at all, and if I try the default theme, the checkbox still doesn’t show.

Is there an extra step I have missed?

Thanks!