Dear 4C Portal User,

To further enhance the security of our online platform and better protect user accounts, we will enable mandatory Two-Factor Authentication (2FA) for all users on 16 November 2026
In addition to your password, you will need to provide a one-time verification code as a second authentication factor.
Once this change takes effect, an additional verification step will be required when signing in.'

Available Authentication Methods

We recommend configuring an authenticator application that supports Time-Based One-Time Passwords (TOTP), such as Microsoft/Google Authenticator, Authy, or similar applications.
Setup is simple and can be completed by scanning a QR code presented within your account settings.
If you are using a password manager, most commonly used applications also support generating a TOTP similar to a mobile app in addition to storing the login password.
Until a TOTP authenticator has been configured, 4C Portal will automatically send a one-time verification code to the email address associated with your account on login attempts.
This code can be used as the second authentication factor during login and you will therefore not be prevented from accessing 4C Portal.

Important Information for Shared Mailbox Users

If the email address associated with your account is a shared mailbox or team mailbox, you may consider not setting up an authenticator app on a personal device and solely rely on the code sent via email.
Anyone with access to that mailbox may be able to view authentication codes, but delays in receiving or retrieving those codes could impact your ability to sign in.

In case your company implements usage of password managers on an organisational level, which enables you to also store login credentials and TOTP generator information in a shared 'vault' (like 1Password, Bitwarden/Vaultwarden, etc), we highly recommend to use that feature for 4C Portal accounts linked to shared/team mailboxes.

What You Need to Do

No immediate action is required at this time, but you may already configure 2FA in your account settings.
We encourage all users to complete the TOTP authenticator setup at their earliest convenience.

If you have any questions or require assistance, please contact info@4c-services.org or zimmer@4c-services.org.

Thank you for your cooperation in helping us improve the security of our platform.

Best regards,

4C Team / Benedikt Zimmer