On 12/09/19, netbank adapted its online banking to the new Payment Services Directive (PSD2): https://www.netbank.de/privatkunden/service/Starke-Kundenauthentifizierung/#.
Account data retrieval is currently not possible via Outbank. We are already working on full speed to solve the problem – no action is required from your sight right now.
Thank you very much for you understanding.
You can find detailed information about PSD2 in our blogpost.