I go to Loughborough University and we have Anyconnect with Duo. I use OpenConnect for the VPN and I wrote a little Rust tool[1] to extract the HOTP secret and use FreeOTP to generate the codes [since Bitwarden seems to only have TOTP, not HOTP :/]
[1]: https://github.com/videogame-hacker/duo-hotp-export