This is the #1 issue for discount codes, and occurs when the discount code is disabled. Open the discount code edit page and make sure "Active" is selected.

This error occurs when the expiration date and time for a discount code has passed. Open the discount code edit page and make sure the expiration date and time are correct.
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If the discount is not meant to have a specified end time, uncheck “Include an expiration date for this discount”.
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Double check the code entered. Make sure you're using a discount code from the same event bucket -- discount codes do not work across event buckets, only within the event bucket that they're created.

The "Target" of the discount code used does not match the order. For example, perhaps a customer was trying to use a discount code to buy a pass, but the discount code targets only ticket orders. Check that the discount code is targeted correctly, and read our guide to targeting discounts.

The "Restrictions" of the discount code have been exceeded for the customer. Check that the discount code's restrictions are applied correctly, and read our guide to discount restrictions.

The specific word "code" here means that the particular code has exhausted its uses as part of a multicode discount.

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