Trouble with importing MTG cards.

A friend of mine and I are trying to play with the new Avatar set of Magic the Gathering, but I can't get any of my mods to import the cards from Scryfall. I don't think it's because the set isn't released yet, because we did the same with Spider-Man like three weeks before it was released.

Every time we try to import the set or do a Draft import, it says it can't find cards or that the TLA set doesn't exist. Anyone know how to fix this?