Unused coupon marked as used

[Thundar]

Preconditions (*)

1. Magento 2.3.6 (I've checked code version for Magento 2.4 and it's the same) and minimum order amount limit set
2. Registered user
3. Coupon code with 1 use for customer and fixed discount amount

Steps to reproduce (*)

1. Fill the cart up to the minimum order amount
2. Put the coupon to the cart just before the last checkout step, so the new total order amount is below minimum amount
3. Submit the order in the fastest way (i.e. I used payment-information API)

Expected result (*)

1. The order is not placed, an error about minimum amount is shown
2. The coupon is still usable

Actual result (*)

1. The order is not placed and an error about minimum amount is shown
2. The coupon is marked as used for the customer (in salesrule_customer ) and cannot be used again

Hint maybe:
The coupon is marked as used by CouponUsagesIncrement, a plugin to beforeSubmit of QuoteManagement. The quote validation is in submitQuote, nested to submit, so it is run after, and throws uncatched exceptions up to the frontend, so the database keeps the coupon as used.

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @Thundar. Thank you for your report.
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[m2-assistant]

Hi @ajijshekh123. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-Oscar
Thank you for verifying the issue. Based on the provided information internal tickets MC-41267 were created

Issue Available: @engcom-Oscar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[navaneeth-m-terrificminds]

Hi, can we prioritise this issue?