My PC lost power at the very end of a Siege match after victory had been declared, and now, after a complete re-install, opting in and out of the current game version, the game crashes upon logging in.
Can you try deleting 'history.json' file located under Documents\Mount and Blade II Bannerlord\Data\Native?
IF this not works can you please delete this folder and try again? "C:\ProgramData\Mount and Blade II Bannerlord"
If this also does not work, please reinstall the Battleeye software as noted in here.