x15 R1, docking station?

Hi,I bought the named notebook. Design, great - feeling - great, performance - great for office at least, no time to play at the moment. Shopping experience? Is "nightmare" the right word?

Anyway, lets come to the point: I want to plug it to a docking station when I am at home so that it will get power, network and two additional monitors. I have a Digitus USB-C docking station here and .. it somehow works until the battery of the laptop is full. After that point, a message appears and tells me that the USB port uses too much power.

Does anyone have a docking station that works? DELL sales will not sell me a docking station because it is not supported. 

I can accept that this will not work in gaming mode - but in normal operation it should work. The USB port is built to accept external power sources. I bought the notebook because of the design and the technical specs and not because of gaming.

Best regards,
Roger