How the secondary verification works?

Hi, wanna ask about Secondary Verification and Email Verification in the Login Protection Settings in game.

I never been used them. How they work?
If i enable it, will it ask for verification code when anyone try to log in to my account?

So in this case i already linked my account to the twitter, email, and mobile number.
But it's most likely my twitter has been hacked, so i think i need to prevent the hacker use the twitter to log in to my pubg account.

I still dont know what the best way to do.
But for now, would the secondary verification protect me?
Solution
If your Twitter account has been compromised, we recommend you to contact Twitter support for further assistance to recover your account. Alternatively, you may also unlink Twitter from your game account if you have another linked login method.

If this does not stop the person who compromised your account to access to your game account, please contact the in-game customer service for further assistance in this regard.
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