Hi Ananay Ojha,
Security questions aren't used as an authentication method during a sign-in event. Instead, security questions can be used during the self-service password reset (SSPR) process to confirm who you are. Administrator accounts can't use security questions as verification method with SSPR.
When users register for SSPR, they're prompted to choose the authentication methods to use. If they choose to use security questions, they pick from a set of questions to prompt for and then provide their own answers.
ref:
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