Microsoft 365: login disrupted Microsoft describes the problem as follows: “Users are unable to authenticate with the Authenticator app when signing in to Microsoft 365 services in some browsers.” ...

Microsoft Authenticator is a security app for two-factor authentication. It competes directly with Google Authenticator, Authy, LastPass Authenticator, and others.

Microsoft Authenticator provides multi-factor authentication options, as well as a password manager. Here's what you should know about the app.

I prefer the option to use an authenticator app rather than receiving codes via text message whenever possible, and so should you. The reason is simple logistics.

The feature, which Microsoft is calling Authenticator Lite, is designed to allow business and education users to access one-time passcodes without the need for an additional authenticator app.