Okay, so my clan is level 5 already and I have no idea how we're leveling up lol. I heard you only level up if you're playing with them?
Correct, you earn 50 Clan XP per Member per Win, 10 Clan XP per Member Per Loss in regular Multiplayer modes. Must play with at least (1) other member. Also you can earn in the Clan vs. Clan playlist that requires 4 members, not exactly sure how much it earns, bounces back and forth between 300-400 Clan XP per Win, 75-250 Clan XP per Loss. Anyways, keeping an updated list of ways to earn Clan XP and the Rewards on my clan's website for my members. Hope this helps!