What happens if I can't reset security questions

"If you forgot the answers to your Apple ID security questions" click here --> https://support.apple.com/HT201485

If you see the message "not sufficient information" see if at this stage you can still sign up for Two Factor Authentication:

Two-factor authentication for Apple ID --> https://support.apple.com/HT204915

If you cannot resolve the issue by signing up for Two Factor Authentication, "Contact Apple for help with Apple ID account security"; click here --> https://support.apple.com/HT204169

Try Apple ID Support. From the article below. 

Without proof of your identity via security questions and other carefully selected criteria, Apple Support can't help you reset a password or perform any other actions on your account. These policies are audited and reviewed on a regular basis.

Security and your Apple ID.    *

Apple ID - Official Apple Support.    -

Contact Apple for help with Apple ID account security - Apple Support.  * (Link doesn't always load)  

Get Support   - Work through the screens to get a chat option. 

Apple Support schedule phone call. -

https://twitter.com/AppleSupport.  -

See if anything here helps. 

Solution to the forgotten Apple ID security questions.  -