There is a new Onlinebanking portal at SWK Bank. 

Customers have to create new credentials for the Login.
Just click on the following link, to order your ne Onlinebanking-ID:  https://banking.swkbank.de/aktivierung/freischaltung

After that please update your credentials in Outbank:
Settings > SWK Bank > Credentials > enter your new 12-digit Onlinebanking-ID and your password.