Thanks again for your help on this, John. I didn’t get it working in the end and instead reverted to using WooCommerce hooks to append fields to the registration form.
I’ve not ruled out revisiting your proposed solution at a later date though as I’m using an ACF form on the user’s account page and would ideally like to be using the same one on the register form, rather than maintaining two sets of fields. If I do eventually get it to work I’ll update this thread with my results.
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