Solved
Cannot create house parties anymore!
Problem as above; It appears that it may be mod related as I can't quite find literally ANYONE else with this same issue as i've searched for hours on multiple occasions.
However I have removed mod...
I ended up doing a fresh install of the game and weeding through my thousands of mods to find the culprit. It was a party mod that worked once upon a time but got messed up by an update!
Thanks for actually trying to resolve my silly issue
