Unable to add configurable product to cart on any non-default store view

Author: shikhamis11

app/code/Magento/ConfigurableProductGraphQl/Model/Cart/BuyRequest/SuperAttributeDataProvider.php

@@ -93,7 +93,7 @@ public function execute(array $cartItemData): array
             throw new GraphQlNoSuchEntityException(__('Could not find specified product.'));
         }
 
-        $this->checkProductStock($sku, (float) $qty, (int) $cart->getStoreId());
+        $this->checkProductStock($sku, (float) $qty, (int) $cart->getStore()->getWebsite()->getId());
 
         $configurableProductLinks = $parentProduct->getExtensionAttributes()->getConfigurableProductLinks();
         if (!in_array($product->getId(), $configurableProductLinks)) {

app/code/Magento/QuoteGraphQl/Model/Cart/AddSimpleProductToCart.php

@@ -63,7 +63,7 @@ public function execute(Quote $cart, array $cartItemData): void
 
         try {
             $result = $cart->addProduct($product, $this->buyRequestBuilder->build($cartItemData));
-        } catch (Exception $e) {die($e);
+        } catch (Exception $e) {
             throw new GraphQlInputException(
                 __(
                     'Could not add the product with SKU %sku to the shopping cart: %message',

dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php

@@ -416,6 +416,44 @@ public function testAddConfigurableProductToCartWithCustomOption()
         $this->assertResponseFields($item['customizable_options'], $expectedOptions['customizable_options']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/ConfigurableProduct/_files/product_configurable.php
+     * @magentoApiDataFixture Magento/Checkout/_files/active_quote.php
+     * @magentoApiDataFixture Magento/Store/_files/second_store.php
+     */
+    public function testAddConfigurableProductToCartWithDifferentStoreHeader()
+    {
+        $searchResponse = $this->graphQlQuery($this->getFetchProductQuery('configurable'));
+        $product = current($searchResponse['products']['items']);
+
+        $quantity = 2;
+        $maskedQuoteId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1');
+        $parentSku = $product['sku'];
+        $sku = 'simple_20';
+        $attributeId = (int) $product['configurable_options'][0]['attribute_id'];
+        $optionId = $product['configurable_options'][0]['values'][1]['value_index'];
+
+        $query = $this->getQuery(
+            $maskedQuoteId,
+            $parentSku,
+            $sku,
+            $quantity
+        );
+        $headerMap = ['Store' => 'fixture_second_store'];
+        $response = $this->graphQlMutation($query, [], '', $headerMap);
+
+        $cartItem = current($response['addConfigurableProductsToCart']['cart']['items']);
+        self::assertEquals($quantity, $cartItem['quantity']);
+        self::assertEquals($parentSku, $cartItem['product']['sku']);
+        self::assertArrayHasKey('configurable_options', $cartItem);
+
+        $option = current($cartItem['configurable_options']);
+        self::assertEquals($attributeId, $option['id']);
+        self::assertEquals($optionId, $option['value_id']);
+        self::assertArrayHasKey('option_label', $option);
+        self::assertArrayHasKey('value_label', $option);
+    }
+
     /**
      * @param string $maskedQuoteId
      * @param string $parentSku