Unable to set raw DUID for WAN

[sloopbun]

Hello,

I am using pfsense CE 2.7.2 and trying to get ipv6 working.

My ISP is Orange in France and has pretty strict requirements. I think the only one I am missing is setting the raw DUID. According to instructions on pages like those below, it should be 00:03:00:01:01:XX:XX:XX:XX:XX:XX where XX is the MAC address

When I try to do this in the pfsense webgui, at Settings, Advanced, Network I cannot get the whole string to save. Only my mac address. I tried saving the correct string in the config.xml and while it is saved there, I can see from tcpdump that it is sending a different DUID.

Thanks for any guidance here!

https://medium.com/@cyayon/use-your-own-router-with-orange-isp-8eac32895983
https://docs.opnsense.org/manual/how-tos/orange_fr_fttp.html