In your Doccle account, your username and password are not sufficient to open your highly secured documents. This requires a two-step verification, which we support at Doccle in the form of eID (electronic identity card) and itsme.
If you do not use an eID card reader, or if you do not have the possibility to use itsme, you cannot open highly secure documents on Doccle for the time being.
However, at the moment only KBC and My eBox (the government) require two-step verification. In both cases you can log in with alternative methods via their own online platforms.