Thanks for reaching out to us, I am happy to help!
Our UD-6950H docking station originally came with a USB-C to USB-A cable for connecting to the USB-A port on the Surface Laptop as well as the USB-C to USB-C cable. The miniDisplayPort output on the Surface Laptop can be connected directly to a display but does not carry a USB data signal for the docking station and a USB-C to MiniDisplayPort cable will not be compatible.
If you no longer have the USB-C to USB-A cable that came with the docking station, please send me an email at ‘firstname.lastname@example.org’ with the subject line ‘Ticket #279686 - Attn: Pat’. In the body of the email please let me know your Amazon Order ID ( available from Amazon.com/orders ) for the original purchase of the docking station and I can help to make sure you get the correct cable for your system and docking station.