After some headaches I got my new Canon i-SENSYS MF754Cdw working. It needs enabling WSD via the Webinterface of the MFD. To enable WSD scanning, go to "Preferences -> Network Settings -> WSD Settings ...

WSD (Web Services on Devices) is a common protocol used by network-based scanners that is not natively supported on Linux. Because of this, most persons cannot scan directly from MFPs (multi-function ...