@aagaag Sorry, never with pfsense, although I did find a tutorial that stated it could be used with Tomato, which gave me some hope.
Two links, both very similar:
https://www.safervpn.com/support/articles/115001428485-Manual-L2TP-Setup-for-Tomato-Router
https://www.limevpn.com/how-to-use/tomato-routers-l2tpip-sec-setup-instructions/
This didn't work for me, because I have a Static IP (over PPPoE). The setup requires the main (WAN) internet connection to be setup as L2TP. Sounded logical (from a newbie perspective) but improbable (with a little knowledge).
Since both links are from the relevant support teams of VPN providers, maybe it does work, and these similar settings could be applied to pfsense?
http://pfsense.local/interfaces.php?if=wan offers an IPv4 Configuration Type option of L2TP.
If I had a 2nd WAN, I would try it, but think it may also fail if your connection is PPPoE?
Maybe the gurus can help explain (but keep it simple, please?)
Many thanks.