Why does a customer get "No eligible items in your cart for this coupon"?

The coupon is limited to certain products or categories, and nothing in that shopper's cart qualifies.

1. Go to Marketing → Coupons and click Edit on the coupon.
2. Look at Product eligibility:

• Only these products/categories: the cart must contain at least one of the listed Products or a product in the listed Categories.
• All except these: products in the lists are excluded.

1. Add the missing products or categories, or choose All products.
2. Click Save coupon.

If the coupon is also limited under Customer eligibility, check that list too, as that gives a different message.