To ensure security, the confirmation code generated by the authentication app expires after a short period of time. If you are unable to log in with the code, it may have already expired. The app automatically generates a new code that you can use if you were not able to enter the previously displayed code on time.
For other problems when using third-party authentication app, please see the service provider's help pages for assistance. A selection of free OTP apps and their help pages can be found under Security.
If you cannot find the secret key, you can contact our customer support to see if it is possible to deactivate 2FA. However, please keep in mind that two-factor authentication is an account security feature and therefore cannot be instantly switched off. A stringent verification process is required, and is not always successful.