In Settings, Delivery address, only the address is required. Many people do not write their full name on top of the address. I have asked many times partners to give me their full name and to add it to their profile address. One letter was returned to me because there was no name on top of the address. Could you please ask for full name and address in the Delivery address when someone registers.
I have renamed that text area to "Your name and address" and added in the details next to it "Fill in your complete address, including your name, street, city, postal code and the country".
Hopefully this will help.
