Super short version
Various web services at Umeå University require MFA/2FA when logging in with your Umu-id. This is to reduce the risk of your account getting in the wrong hands, just because they managed to guess your password.
Using your mobile phone (private or work) with an Authenticator app is the best option for Umu-id, but other options (such as a YubiKey hardware key) exist.
For CS-account we recommend the use of Passkeys, though a mobile phone with the same Authenticator App as Umu-id is a good backup for when/if the Passkey is not available.
Note: The CS-account will introduce MFA requirements some time after Umu-id MFA is finished.
Instructions for CS-account
Continue to MFA instructions for CS-account