Trying to change security questions
I began the process and was told a verification code was being sent but I never received it on either gmail or text. I repeated several times with same result.
iPhone 7, iOS 12
contact Apple ID Support.
Apple Support by e-mail or chat Work through the screens to get a chat option. You may need to pick a problem that is slightly different than yours to get a chat option.
Or fill out and submit this form. The form is for iTunes, but it will get passed to the ID Support section.