Cant equip either of the new skins of ryze , morgana , riven etc.

For some reason whenever i join a lobby and pick my champ and try to pick one of the new skins released on 9.19 it says its locked , like i never bought them. but i did bought them since they are on my purchase history . Also i have seen others being able to equip the new skins . i asked them how to but they never replied. So does anyone know a way i can use the new skins i purchased cause i dont like waiting like 5 days for the splash art update :( .
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