Surprise: Microsoft is enabling Gmail users to collaborate with others using Azure Active Directory B2B without requiring them to have a Microsoft account.

Google Authenticator now syncs one-time codes with your account, so you're not stuck if you lose your device.

Google isn’t the only firm offering 2FA sign-in codes to provide backups. Since 2019, Microsoft has allowed people to use a “backup and restore” tool for its Microsoft Authenticator app.