Im confused.

So i got the mission FINAL BOSS! Veigar that says: Win one matchmade game with Veigar on either team Equip Arcade icon to complete this mission. So i did that. I got into a game and played as Lisandra mid and Veigar was a support. The game was Normal Draft. And we won. So i dont see why i didnt get the mission. Please help me . I put a link so you guys can see it.