Answering my own question: You must include acf_form_head() at the top of the page to process the form:
https://www.advancedcustomfields.com/resources/acf_form/#notes
This is an old post – but I wondered if anyone could help: When I set this up, the first name and last name automatically were populated by the existing first and last name, but the same is not true for the email address. How can I link up the email address to the users email address?
I should also mention, I suppose, that this doesn’t actually succeed in creating new users for me – but one step at a time.
No, I was never able to get this to work. It appears that this is not functionality that is available with ACF.
I wonder if this could be simplified somehow by the fact that much of the info in that array is going to be the same for every one of the attributes I’m trying to add. I’m really stuck with this – WooCommerce is well developed as a one-size-fits-all system, but the client wants the product entry streamlined for his very specific application, where products will have three and only three attributes. He enters many products and wants to eliminate any extra clicks. In the default new product process, adding attributes requires several clicks that seem unnecessary.
