did anyone find a solution? I have the same issue on prestashop 1.7.5.2. It actually imported correctly the first time, and now doesn't import anything. It keeps telling me the the email address can't be validated, any kind of email doesn't pass anymore.
It basically rtells me that the email cannot be validated and that the property Customer->my_address_required is empty
in the attached screenshot I had tried also leaving out the id column, but it gives the same result in any case I try. Any ideas?