Different Versions of the Game?

So I’m trying to join a friend’s lobby/squad/whatever so we could do some Achievements together. He invites me, and I accept. It starts loading, but then I get an error saying “Unable to join the squad. You have a different version than the squad leader”. Immediately after that, I get a notification saying I’m connected to the online services. I try again, same thing. We both have the Ultimate edition of Halo Wars 2, and we are able to access the new leaders that dropped today. I don’t recall seeing this in the notes before the update dropped. Is this a new thing or has someone seen this before. If it’s the latter, how do we fix it? We’ve already tried to reset and restart our consoles, nothing happened. Thanks in advance.