Not recommended to bump-up old posts like this one!
WHY ???
Because you will follow old and depricated stuff. Just like you already doing right now!!!
Wix-Users-API is an OLD and DEPRICATED-API !!!
Using on your own risk !!!
Instead use a newer API called → Wix-Member(s) !
Never bump-up old posts → instead open your own one and describe your issue!