Configure 802.1x authentication

For the past week, I have been documenting how I can use my router as a wired 802.1x client. During this time, I learned how to use SSH, connect the router to a personal hotspot to install packages, edit configs, and decided that making a firmware image was the way to go. A colleague at uni instructed me on using a Linux VM and I managed to flash my image on the router (Archer MR200). I was proud of the little project that I had going on but in the end, I wasn't able to establish a connection. I think that the interface I selected for 802.1x auth is not the right one because I don't fully understand their use. Currently, I don't have any other setting because I want to get the auth going first and then set other things up but I can provide any configs if necessary.