At the moment you cannot use 2FA for the Tutanota Android & iOS apps. Support of 2FA in the apps will be added in the coming months.
It is not required to set up 2FA on your account, but it is recommended if you'd like the peace of mind that comes with the additional security.
Registering your second factor
You can connect your second factor with Tutanota in "Settings" -> "Login". As admin you can setup second factors for your users in "Settings" -> "User management".
Tutanota currently supports the following second factor types:
- Security keys (U2F), e.g. Yubikey. U2F is currently supported by Chrome and Opera.
- TOTP with an authenticator app such as Google Authenticator, Authy etc.
- We plan to support more second factor types. Please let us know via social media which ones you prefer!
Note: If you lose your second factor, you will no longer be able to login to your account. To prevent this, you can add multiple second factors and additionally note down the recovery code shown to you when adding a second factor.
Authenticating with your second factor
During login you have to authenticate with one of your second factors. Instead, you may also accept that session from another logged in client. If your browser does not support the second factor you had registered, you can only accept the session from another client.