by Tim Titchmarsh.
Hi
Did you get this to work?
I'm having similar issue, I can get user data by id but not by email, username etc. I think its because email and username (and many others) are optional fields and return blank when I fetch using core_user_get_users_by_field and passing the id field via the webservice.
Anyone know how to enable these optional fields and return data instead of empty fields?
Thanks
Tim