Hello there, Total War Community!

I have a situation on my hands and I'd hoped you guys could help me out.

Basically, I've made a faction rename mod over on the Workshop called 'Appendices I: Faction Names, Subcultures & Confederations', it's a mod designed to do exactly as it says.

Now, the issue I have is this; my subscribers and I want to separate the Dark Elves into the (placeholder name) 'Upper Druchii Nobles' and 'Lesser Druchii Nobles'. I have done that with no issue, however, now the two subcultures cannot confederate with one another. I have made sure to list them both as the same CULTURE, but still, they don't seem to be able to confederate. Is there any way around this?

Many thanks,
Roseheart.