PROMO code apply on the shipping showing null in graphql responce

[Abhay-Agrawal]

As a ___ I want to ___ so that ___.

Steps to reproduce:

1. Navigate to Marketing Menu-> Promotions -> Cart Price Rule

2. Add the New Rule

3. Add the One Rule and apply it on shipping Amount. Plz check the attached screenshot to add shipping rule
   

4. apply the same PROMO code on the shipping amount

5. check the graphql response

6. showing discounts null
   "discounts": null,
   "discount": {
   "label": [
   "FreeShip"
   ],
   "amount": {
   "value": -15
   }
   },
   or
   Run cart graphql query:
   {
   cart(cart_id: "croja3eQTvZe2OI26BoMyN94N9B2z3Fd") {
   email
   items {
   uid
   prices {
   total_item_discount {
   value
   }
   price {
   value
   }
   discounts {
   label
   amount {
   value
   }
   }
   }
   product {
   name
   sku
   }
   quantity
   }
   applied_coupons {
   code
   }
   prices {
   discounts {
   amount {
   value
   }
   label
   }
   grand_total {
   value
   }
   }
   }
   }
   Expected result:
   All Graphql requests having discount field should return correct discount value in response

Additional Information:
Please refer the comment

[m2-assistant]

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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
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[engcom-November]

Verified the issue on Magento 2.4-develop branch and discount amount applied on shipping amount is ignored. Only discount on product price is displayed in graphql response.
Steps performed:

1. Created cart Price Rule Specific Coupon, Actions - 100 % discount and Apply to shipping amount - yes, Free shipping - For Shipments with matching items
   
2. Front-end - login as customer - Add product to cart and select Flat rate shipping methods.
3. Apply discount
4. Run the cart graphql query
   Issue: Total discount is displayed ignoring discount applied on Shipping amount
   
   
   While on UI - discount amount is displayed including the discount applied on shipping amount.

[github-jira-sync-bot]

✅ Jira issue https://jira.corp.magento.com/browse/AC-3182 is successfully created for this GitHub issue.

[m2-assistant]

✅ Confirmed by @engcom-November. Thank you for verifying the issue.
Issue Available: @engcom-November, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[Abhay-Agrawal]

It is same #31270

[artskirk]

@magento give me 2.4-develop instance

[magento-deployment-service]

Hi @artskirk. Thank you for your request. I'm working on Magento instance for you.

[artskirk]

@magento I am working on this

[magento-deployment-service]

Hi @artskirk, here is your Magento Instance: https://2bf5c86cb5618be4bbdc1d648e595617.instances.magento-community.engineering
Admin access: https://2bf5c86cb5618be4bbdc1d648e595617.instances.magento-community.engineering/admin_5162
Login: 4adf9199
Password: adb858cc9229

[engcom-Charlie]

As mentioned in PR, the internal team worked on this issue and committed in this revision.

Hence closing this issue.

Thank you!