Epic Game Store not allowing $10 coupon to be used on Season Pass

I don’t know if there is a better place to post this info, but I’ll mention it here just to see if it helps. The Epic Games Store started their sale today and one of the features is a free $10 coupon. However, it cannot be used on season passes or DLC. So I can’t use it to buy the Season Pass or any DLC for Phoenix Point. Rather disappointing. I know there might be some logical reason for it, but if I can’t use a coupon I’ll just hold off on getting the season pass till at least the first DLC releases.