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After an otherwise successful update to Magento 2.2.9, the discount code functionality has stopped working.

When I try to apply it on the Cart page, nothing happens. When I try it on the Payment Method step of checkout, I receive a "Could not apply coupon code" error.

Does anyone know what could be causing this, or how to investigate?

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Formkeys were added to the coupon form in 2.2.9 (as well as forgot password form for customers).

In your template Magento_Checkout/templates/cart/coupon.phtml, inside the <form> element you'll need to add:

<?= $block->getBlockHtml('formkey'); ?>
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  • Hmm, this was a promising answer, but doesn't seem to have helped.
    – brackfost
    Jul 19, 2019 at 16:15
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    I think that this solution, in tandem with updating an extension, ultimately fixed my issue. Thank you!
    – brackfost
    Jul 19, 2019 at 17:46
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    @brackfost That would have been my next suggestion; to check for any third party modules that could be breaking it. We had a normal coupon flow & the formkey was the solution in the end, where we saw the cart page just refreshing. Jul 22, 2019 at 7:36

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