Can't get a dual monitor setup with Dell dock station

[DeWell]

Hello,
I've been trying to get a simple (not daisychain) dual monitor setup with Dell Latitude and 2 Dell p2314h monitors via a Dell (Displaylink) D3100 dock station. This dock station has one Displayport out, and 2 HDMI out.
I have one monitor connected via the displayport - works out of the box. I connected the other monitor via the HDMI out, using a HDMI-to-Displayport cable.
The HDMI connected monitor simply says it doesn't see any signal from the computer (dockstaion) and remains blank. Likewise, windows (10) tells me it doesn't detect any monitor (apart from the Displayport one).