Microsoft Authenticator is a security app for two-factor authentication. It competes directly with Google Authenticator, Authy, LastPass Authenticator, and others. You may run into the app when updating your Microsoft account settings or enabling two-factor authentication there. Alternatively, you may want to have a TFA available for your own security purposes. You can download Microsoft Authenticator from the Google Play Store or Apple App Store. Let’s talk about Microsoft Authenticator and how it works.