tarot cards and allies

been trying to set up teams through the vanilla commands so me and my friends can get the buffs from tarot cards and not get the slowness debuffs from each other. for some reason when doing

/team join *teamname\ *playername**

it says added player to team but it never actually does

wondering if ftb teams is overriding the default commands or something similar. anyone had similar problems or a work around for the tarot cards?

playing fear nightfall remains of chaos if that changes anything

thanks in advance :)