Authentication using the iTAN Card method is currently not possible in Outbank.
Please use "flateXSecure" for your accounts: https://www.flatex.de/handel/mobiler-handel/flatexsecure/
To activate the TAN method in Outbank, update the credentials the app settings:
'Settings'> 'Bank Credentials'> 'Select Flatex'> 'Update Configuration'
Flatex: Error Message Dialog abgebrochen - starke Authentifizierung erforderlich (9075) - macOS-Version / Known Issues / Bank errors - Outbank Helpdesk
flatex, flatexsecure, itan card, starke authentifizierung