Can’t change security questions
I can’t change my security questions keeps telling me now enough information.
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If you have two-factor authentication enabled, that replaces the security question (after two weeks). If you don’t have two-factor enabled, you can enable two-factor authentication and the security questions will be purged (after two weeks). Otherwise, you’ll likely be trying a reset (see link below), or discussing this with Apple (see Get Support link in upper right of this webpage).
If you forgot the answers to your Apple ID security questions - Apple Support (archived)