Reinstalling BattleEye using the .bat files will solve this issue. You can find the related files in the folder below:
"...\Mount & Blade II Bannerlord\bin\Win64_Shipping_Client\BattlEye"
I did that too at begining im not lying. I just want to be able to play this game on multiplayer not just singleplayer. I spend money on that and im without multiplayer its terrible situation. I got no other games for multiplayer. And support treat me like im lying or youre out of ideas how to fix it?