[2021] Empire not showing at Multiplayer anymore

I have seen the occasional report like this over the years. I'm not sure the devs have been able to duplicate and fix the problem, so I suggest you post the issue and save game in the Bug Reports forum here, so QA can look into it.

As far as your campaign goes, from what I hear i t is possible to manually edit the save file to fix it up. Your best source of help for that would be the User Mods forum here.

Good luck with that, and sorry for that problem!