louvre is now a new debian stable (buster) which drags a new easy-rsa version 3.
The modus operandi is different.

This means:

• migration? [1]
• the intranet documentation [2] needs to be updated once understood how that works [3] [4]

[1] https://github.com/OpenVPN/easy-rsa/blob/master/doc/EasyRSA-Upgrade-Notes.md

[2] https://intranet.softwareheritage.org/wiki/VPN#For_admins

[3] https://github.com/OpenVPN/easy-rsa/blob/master/README.quickstart.md

[4] https://github.com/OpenVPN/easy-rsa/blob/master/doc/EasyRSA-Readme.md