The problem you are facing is that spotify does not allow you to login with your normal credentials but requires you to set up an OAuth2 authentication flow. This is meant for people that develop applications that allow people to log in with their spotify credentials. You can’t really do this easily with a KNIME workflow, if you just want to do some experiments on your own data, you could try setting up an sample app in python or javascript, extracting the login token and using that in your workflow. With Javascript you might even be able to do the login from within KNIME AP.