Is the hotspot "Masking" the connection? In other words is it a true, authorized by carrier hotspot use or is it "faking" the data stream as being used only by the phone and not the computer that is really using the data?
If your hotspot is masking, use a direct WiFi or LAN connection.
If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See this link for instructions on how to join Windows Central.