Trying to use virtualhere over internet, not working

I'm trying to use virtualhere over the internet (not my local home network) to control my computer (windows 11) with my android tablet.

Virtualhere works fine when I'm on my local network, but I can't get it to work over the internet.

On my computer I've port forward TCP 7575 and, in the client under specify hubs, I've added the public IPV4 address of my android tablet that I have the server running on, but it does not connect to the hub. Sometimes the client will show a quick message "Connecting to USB hub" but then it disappears and the hub never shows up.