Invitation code can be only filled out during registration, once the registration is complete nothing can be done.
We recommend by copying the "Invitation link" for your family/friends then you can ensure that your right is protected. (In case the code is not filled out.)
If you need further information, please contact us through the following information
【ACE customer service center】
Help Center: https://helpcenter.ace.io/hc/en-us
Business hours: Monday to Friday 10:00-18:00, Lunch Hour 12:30-13:30 (GMT+8)