I posted on the main thread too, but I believe your issue was due to a version difference. I updated the mod yesterday and it usually causes an error when both players reach specific sync points and the game sees the versions are different. I updated the version in the mod to reflect 1.2 update, hopefully a quick update will fix the issues for you

Thanks, I'll check it out and report any issues

In the event that this causes a day or two of issues, please note that this mod was updated today, 9/4/2023. If there are issues kicking people out of campaign shortly after starting, verify everyone sees version 1.4. If not, someone needs to update, it's a super common issue and hopefully this helps.

Just went through the whole campaign with friends. There might have been some animation freezes on some elite grunts, but everything else is solid.

I fixed the animation stuff today I believe, it was missing dual wielding animation references that should be live now. Thanks for letting me know