The response for `127.0.0.1:8111/map_obj.json` in the WebUI is empty

I recently used the WebUI at 127.0.0.1:8111 after a while and noticed that units and bases are not appearing on the browser map. Upon investigation, it seems the response for map_obj.json is empty, indicating that the game itself is not outputting this information.

Is anyone else experiencing this issue?

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It appears they have implemented an authentication system where the game fails to respond to certain WebUI requests unless you access the game via the WT Assistant mobile app.