Our network has 2 choices to get access. Proxy (using HTTP(s)/SOCKS5) or VPN (L2TP w/PSK).
To use as a VPN you will need to have a device/software that supports L2TP with Pre-Shared Key. If your device/software doesn't support that you will not be able to use the VPN and most likely will be able to use proxy.
We have created profiles for certain devices/software. Once you connect to a location you will see the credentials for the VPN as well as profiles.
The profiles we have are specifically made for iOS/iPadOS/MacOS and SoftEther. (Note: for iOS/MacOS profiles to work correctly you must use them from within Safari browser)
We have also created several YouTube videos which explain how to setup using Windows 10 Pro and Mac/iOS.