Industrial Linux Computer Is Disconnecting From The VPN A Few Seconds After Establishing A Connection?

I am able to establish a VPN connection, but I immediately get disconnected from the VPN a few seconds later. I believe that connecting to the VPN is causing my WiFi to disconnect, but I am not sure if this is what's actually happening.

I have tried a bunch of different things, like disabling the local firewall on the industrial linux computer, and disabling IPv6.

I am on Ubuntu 20.04.6 and Mint, and downloaded the Debian client directly from the Fortinet website. I have been able to connect to the VPN fine on Windows/Mac computers, so I don't think it's an issue authentication issue, especially since I am passing the authentication phase on the Linux.