This is a common option within apps which adds an additional step to the login process.
The login process requests username and password and if correctly entered the page requests an authentication code.
The authentication code can be sent via SMS text, a voice call, or calculated by using an authenticator app.
This method requires installation of a 2FA app on a second device and then registration of the login details either manually or by scanning a QR Code.
- enabling Two-factor authentication makes the login more secure but NOT 100% secure
- when using the authenticator app remember to consider how to login if the second device is lost or stolen
- when using authenticator app the date and time of the application server and the second device must accurately match within a minute or so else login will fail