From what I've learned from interacting with Kobo, the Big 5 don't give them wiggle room on discounts. What Kobo does is create a discount code (GIFT50 just the other day), then only allow certain books to be discounted (
https://www.kobo.com/us/en/p/dec50?u...=00003&utm_id=). So we have to visit a specific list, then remember to add the code ourselves to get the discount.
This might explain why codes shared on here don't have a high success rate. They aren't often global codes. Don't you think?