910 and triple dock usb-c

have a yoga 910, pluggable usb-c triple display dock and two dell monitors, S2415H. I have hdmi cables connected to 4k, and 2k and the usb-c cable supplied connected to the usb-c port on back of pluggable device and the data port usb-c on the yoga. The monitors are not detected on the computer.
I have installed the pluggable driver but no luck.