I figured it out. The Displayport connection to my personal laptop does not deliver connection to USB peripherals. I needed to connect another usb-c to usb-c to make it work. 
I have a U2723QE daisy chained with an S2722QC (U27 Displayport to S27 USB-C). I have a keyboard and camera connected to the U2723QE via the USB ports. The U272QE is connected to two computers, but the keyboard and camera only show up on one of the computers: 1) HP EliteBook 840 (Work computer): Connected via the USB-C Displayport 90W. USB keyboard and camera work on this computer. 2) Dell XPS 13 9300 (Personal Laptop): Connected via Displayport to USB-C. Lose keyboard and camera on this computer. Initially, the USB keyboard and camera were not showing up on both computers, but this was fixed HP EliteBook when I disabled the USB Suspend setting under the power plan settings. I did this with the Dell XPS 13, however, the keyboard and camera are still not working. I've tried all the USB ports available they all seem to be disabled when I'm on the Dell XPS 13.
U2723QE, S2722QC, USB KVM not working