Forgot one of the answer of my security questions
How can I change my security questions when I forgot what is my two factor authentication information
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Read these links please:
About Apple ID security questions
Click here --> https://support.apple.com/HT201363 to "Learn about Apple ID security questions, including how to set up or change your 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
If you're using 2 factor you don't need security questions.
Two Factor Authentication instead of security questions. --> https://support.apple.com/HT204915 "With two-factor authentication, you don't need to remember any security questions. We verify your identity exclusively using your password and verification codes sent to your trusted devices and phone numbers. When you enroll in two-factor authentication, we keep your old security questions on file for two weeks in case you need to return your account to its previous security settings. After that, they're deleted."