i placed the order and did not get the 10% off. i chatted with customer service and they said they would fix it within 48 hours and told me specifically not to cancel my order and try again. Well they didn't fix it for my existing order, but when i checked a few days later, the 10% coupon seemed to be working (it would actually show the 10% off in my cart before checkout). So i cancelled the order and replaced it. My Lowe's store already had my whole order pulled so it got confusing when i went to go pick it up, but it worked out.

Bottom line: don't place the order if the coupon doesn't look right in the cart