Due to changes in the Union Database (UDB), system users are now required to use a two-factor authentication to log in to the UDB.

Please find detailed information about how to set up the two-factor authentication via EU Mobile Login App or mobile number here: https://wikis.ec.europa.eu/display/NAITDOC/EU+Login+-+European+Commission+Authentication+Service#EULoginEuropeanCommissionAuthenticationService-MobileDevice