What FluidNC version are you using? If a v3.9.2 version, port 82 is good. If v4.0.2 (which isn’t tested/recommended for V1 machines yet), it needs to be port 80.
I would turn off FluidTouch and restart the controller to see if you can connect. On FluidNC v3.9, when both the WebUI and FluidTouch are connecting to the websocket on port 82 (which is true for WebUI v3), they will only allow 1 to be connected at a time. If the WebUI works once FluidTouch is disconnected, they may be fighting each other. For me, there is a clean disconnect/reconnect on both FluidTouch and WebUI. But if you’re not actually getting connected on FluidTouch, that could be something else.
You can also connect to FluidTouch via the web installer while running it. Instead of selecting to install it, click for the logs and send those details for when it’s trying to connect.