Two-Factor Authentication (2FA) helps verify your identity and prevent cybercriminals from accessing your private information.
A hacker has various techniques to be able to steal or crack a user’s password, the most common being phishing. But a hacker trying to break into your online account, even a hacker who has obtained or guessed your password, would be locked out without having that second factor.
In this case, your one-time access code sent to your mobile phone or landline is the additional factor
This additional factor is unique to you and should not be shared with anyone.
I have received a One-Time Passcode that I wasn’t expecting, what should I do?