Several reasons may cause a promo code to expire before its stated expiration date:
Low redemption rates or poor performance may cause the merchant to cancel the promotion. You may no longer be able to use a promo code because the terms of the upgrades have changed. There may be a shortage of diamonds associated with the coupon code. Whatever the reason, it's essential to check the expiration date of any promo code before attempting to use it. Otherwise, you may be frustrated when the promo code needs to be fixed.