Sorry for the late reply.
First make sure you have the right version of Bannerlord, which is e18.104.22.1688904. If you then still experience these issues, you can try the following things;
- Run Bannerlord Online as administrator.
- Try running Bannerlord Multiplayer. Make sure this can login.
- Run the Bannerlord Online launcher using a VPN. Try multiple locations if needed.
- Remove Bannerlord Online entirely, from Modules folder and Appdata. Then reinstall Bannerlord Online.