I guess you registrated chinese mobile phone number.
Our rules about the registration of overseas phone number(include chinese phone number) are below.
・About mobile phone number, we are permitting the registration of japanese mobile phone number only.
・About fixed-line phone number, we are permitting the registration of japanese and overseas phone number.
So, if you want to registrate your phone number, please registrate japanese mobile phone number or chinese fixed-line phone number.
