There are a few reasons a Discount Code might not work:

• it's been deleted
• it is only valid for a certain product or specific products
• it has run out of uses
• the discount code is only valid between certain dates

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To figure out why your Discount Code is not working, I recommend you check the Discount Code Settings, find your Discount Code and click Edit

Deleted/Out of uses

These two are pretty self-explanatory

• If you cannot find the discount code in your Settings, it means that it has been deleted by a staff member 
• it has run out of uses - e.g you might have set it to be valid 3 times per person and they've used it 3 times

It is only valid for a certain product or specific products

Check under Discount Amount, if it set to a specific item(s), which items have been selected for the Discount to apply to 

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