I've found some coupons are specific to the app only. They won't work when typed in on desktop version, which is stupid... but probably something to do with marketing and ****. There's another coupon I see popping up and disappearing on my account, so I don't know if it's specific to certain items but posted below...Apparently you can only use the coupon once. So it doesn’t show the discount for me anymore. Only did it on the app, not in a browser on my computer.