Ethernet Connected Computer not Connecting to EXT Network

Hi, I've got a EX2700 extender. A few days ago, my internet went out for a couple of hours and when I reset my internet the next day, my ethernet connected desktop computer (into the wifi extender) connects ONLY to my router's network and NOT the EXT network that I have set up. Every other device is able to connect to the EXT network except my computer. My computer does not have wifi capabilities, but before my internet went out the other day it was connected to the EXT network through the extender. Now, it only connects to the router and I have no idea how to change its connection. I've tried resetting the extender and its network multiple times, tried resetting the modem and router, but nothing works. I've played around with some things on mywifiext.net but to no avail. Any help would be appreciated, thanks.