Desktop connected via Ethernet not showing in list of connected devices

My desktop that is connected to the router via ethernet with a static IP is not showing in the list of registered devices. I can access the admin page for the router on the device and can connect to the internet, but I can not set up port forwarding because the app does not show it as connected. I have seen this same problem listed on the forum in many places without an answer being given in many places, it seems ridiculous that this is so common but the solution can't be shared publicly.