Thank you for your reply. Before I posted my message, I tried everything: swapping cables, trying other laptops, trying all ports (with a DP to HDMI adapter) but the resolution of this screen remained 640x480.
Finally, I tried to connect my Android phone to the dock via usb-c and using the Displaylink app. The screen was now able to view in a resolution of 1366x768. Still not Full HD but it was already more than 640x480. A day later I tried to connect my laptop again and somehow the screen worked! I have no idea what happened, I think the phone connection may have reset something in the dock, but I'm very happy the dock works now. I also tried to connect a different laptop and there it also works now!
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