Proton Authenticator is a new all-in-one 2FA app that wants to take the place of Google Authenticator, Authy, and Duo on your devices.

How to Add an Account to Google Authenticator You need two things: Google's authenticator app and a code from the account you want to add to the app (Facebook, Amazon, your bank, etc.).

Google’s Authenticator App Just Got a Handy New 2FA Tool You can now sync sign-in codes across devices—but they aren’t end-to-end encrypted. Photograph: Rasid Necati Aslim/Getty Images ...