went from Working fine 30 Min ago to same Error message Edit; looks like just closing and reopening BO launcher eventually got an update and solved it.
It's very likely this error occured in between the update from Taleworlds to the base game, and before Bannerlord Online was patched.
Bannerlord Online has since been updated.
Salut, il y a eu une mise à jour depuis, tout est réglé ! Tu devrais être capable de pouvoir te connecter et jouer. Si tu as des soucis, n'hésite pas à me contacter pour que l'on regarde ensemble.