How Turning on Two-Factor Authentication Works Two-factor authentication, which can be abbreviated as “2FA,” is offered by most major online accounts these days.

First, download the Microsoft Authenticator app, which is available for iOS and Android, and log in. Select the Security tab, then on the next page you'll see an option to select Two-Factor ...

That’s why you need to enable two-factor authentication on your most important online accounts, including email, financial and social media.