Cannot access Dell N2048p switch WebGUI over VPN

I am trying to access our Dell N2048p switch over VPN, but whenever I try to get into the WebGUI, it gives me the following error:

Please note that you are a level 1 user and do not have configuration privileges. This session is limited to read-only operations. 

This does not happen if I access the WebGUI from the local network (either being onsite or remoting into a computer on that local network). I am also able to access the switch over VPN if I try to SSH into it and I can ping it, I just can't get into it through the browser.