Discount codes cannot be combined. If a customer has a 10% off discount, they can't also use a "free shipping" coupon. Only one discount at a time can apply to a single order.
Please follow these steps if the customer is not able to use a discount code created through the Returns app.
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From your Shopify admin, click Discounts.
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Click the name of the discount that you want to view the details for.
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Check if any rules are set for the discount codes.
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If there is an expiry date set for a discount, then the discount will expire at 11:59:59 PM on that day.
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If the discount code is applied to specific variants of a product, then the customer can use the discount code for that specific product.