Multi-Factor Authentication improves account security by adding a second way (factor), beyond your username and password, to verify that you are actually signing in to your account. The second factor for your Brooklyn College email account is a verification code sent to an option of your choosing: SMS/text, voice call, or the free Microsoft Authenticator app.
When you sign in to your email for the first time on a new device or application you’ll be prompted to enter this verification code to prove who you are.