icloud security questions

Try using Apple's iForgot service.

If it says they don't have sufficient information, you need to contact Apple's Account Security team. To reach them, click here or here and pick a method; if you can't use any of those listed, choose one from this link.

(201820)

To access the appleid.apple.com first Apple ID and password is filled up , immediately it prompts to enter three answers for security questions .

Even you know the correct questions and answers for respective security questions are not known , the account can't be accessed .

This secondary authentication account has to be converted into two factor authentication from the device see the articles Two-factor authentication for Apple ID - Apple Support (IN)

Get a verification code and sign in with two-factor authentication - Apple Support

Note :

( a ) if you lose answers for respective questions provide credit card details that was added in the account to apple support senior care advisors Contact Apple for support and service – Apple Support