Problem:
macOS presents a warning "Legacy System Extension". The warning continues with "Existing software on your system loaded a system extension signed by "Palo Alto Networks", which will be incompatible with a future version of macOS. Contact the developer for support."
Cause:
Apple macOS 11.0 (Big Sur) is an upcoming significant upgrade to macOS, including changes to how it handles System Extensions. The GlobalProtect VPN client used by the University is created by Palo Alto Networks. It installs a system extension in order to provide VPN services. The current version of GlobalProtect installed on this computer is an older version that is not compatible with macOS 11.0's new system extension system.
Solution:
Install a newer version of the GlobalProtect client. You can find more information and a download link in this article.