Help with USB-C dock and T480 display issue.

I have a USB-C dock that I am trying to set up with my t480 to use multiple displays. The power works, I can connect a mouse/keyboard through it, but I can't seem to get the displays working. When I plug them in, they show in the display options in Windows, but it says they "aren't active". I checked the software and it says the dock is up to date. Any ideas?