How do I sign in using two-factor authentication (2FA)? If two-factor authentication (2FA) is enabled and you want to sign in to the Investimental Portal, in addition to your password you will be asked to enter a dynamically generated code (a unique 6-digit number). This can be done using apps such as Google Authenticator or Microsoft Authenticator, or via SMS, depending on the 2FA authentication method you selected. Share Twitter Linkedin