@eeko_ This is a BO2 issue not a launcher issue it should go here https://forum.plutonium.pw/category/9/bo2-client-support
This error means the host and client connecting have different difficulty settings. If you changed the difficulty to easy the client needs to go in a custom game and change it too before joining you
@HannesC i got it to work, it could have been because i was on a discord call or something else but i deleted the folder in my localappdata, reset my pc and it worked
thanks for the help tho