You most certainly can run Ethernet through conduit. We do it in the trades regularly. However, I will recommend that you don’t run electric and Ethernet through the same conduit as that will cause interference with your Ethernet cable and more than likely make your connection wonky.

when we run Ethernet cable, we zip tie it to the conduit and then have the Ethernet cable go into the box through a romex connector or through a plastic bushing/connector specially made for Ethernet cables. Pm me for pictures if you have any questions. Good luck!