Unable to assign a customer group created via Rest API to a customer

[prowebuk]

Preconditions and environment

Magento ver. 2.4.7-p6, PHP 8.3.22

Steps to reproduce

Customer groups created via the API cannot be assigned to a customer either via Rest API or Admin.

Create CustomerGroup with API POST /rest/V1/customerGroups

[
	"group"=>[
		"tax_class_id"=>3,
		"code"=>"Account-10"
	]
];

Create Group POST Returns:

[id] => 18
[code] => Account-10
[tax_class_id] => 3
[tax_class_name] => Retail Customer

Update customer with new group id via PUT /rest/V1/customers/2

[customer] => Array
        (
            [id] => 2
            [group_id] => 18
            [email] => xxx@xxx.com
            [firstname] => Test
            [lastname] => Account with credit
            [storeId] => 1
            [websiteId] => 1
            [addresses] => Array
                (
                    [0] => Array
                        (
                            [id] => 0
                            [customer_id] => 2
                            [country_id] => GB
                            [street] => Array
                                (
                                    [0] => xxx
                                    [1] => xxx
                                )

                            [firstname] => Test
                            [lastname] => Account with credit
                            [company] => Test Tackle Account 1 (with credit)
                            [telephone] => 0000000000
                            [city] => xxx
                            [postcode] => xxx
                            [default_shipping] => 1
                            [default_billing] => 1
                        )

                )

            [custom_attributes] => Array
                (
                    [sage_account_number] => TEST01T
                    [sage_account_name] => Test Tackle Account 1 (with credit)
                    [sage_invoice_line_discount_percent] => 10
                    [sage_discount_group_idx] =>
                    [sage_credit_limit] => 10000.00
                    [sage_account_balance] => 0.00
                    [sage_price_band] => Standard
                )
        )
)

Update customer PUT returns error 500:

[message] => is unknown type
[trace] => #0 /var/www/html/magento-site/vendor/magento/module-sales-rule/Model/RulesApplier.php(280): Magento\SalesRule\Model\Rule\Action\Discount\CalculatorFactory->create()
#1 /var/www/html/magento-site/vendor/magento/module-sales-rule/Model/RulesApplier.php(257): Magento\SalesRule\Model\RulesApplier->getDiscountData()
#2 /var/www/html/magento-site/vendor/magento/module-sales-rule/Model/RulesApplier.php(146): Magento\SalesRule\Model\RulesApplier->applyRule()
#3 /var/www/html/magento-site/vendor/magento/module-sales-rule/Model/Validator.php(407): Magento\SalesRule\Model\RulesApplier->applyRules()
#4 /var/www/html/magento-site/vendor/magento/module-sales-rule/Model/Quote/Discount.php(205): Magento\SalesRule\Model\Validator->process()
#5 /var/www/html/magento-site/vendor/magento/module-quote/Model/Quote/TotalsCollector.php(261): Magento\SalesRule\Model\Quote\Discount->collect()
#6 /var/www/html/magento-site/vendor/magento/module-quote/Model/Quote/TotalsCollector.php(156): Magento\Quote\Model\Quote\TotalsCollector->collectAddressTotals()
#7 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Quote\Model\Quote\TotalsCollector->collect()
#8 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->___callParent()
#9 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->Magento\Framework\Interception{closure}()
#10 /var/www/html/magento-site/generated/code/Magento/Quote/Model/Quote/TotalsCollector/Interceptor.php(23): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->___callPlugins()
#11 /var/www/html/magento-site/vendor/magento/module-quote/Model/Quote.php(2023): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->collect()
#12 /var/www/html/magento-site/vendor/magento/module-checkout/Model/Plugin/RecollectQuoteOnCustomerGroupChange.php(88): Magento\Quote\Model\Quote->collectTotals()
#13 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\Checkout\Model\Plugin\RecollectQuoteOnCustomerGroupChange->aroundSave()
#14 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Customer\Model\ResourceModel\Customer\Interceptor->Magento\Framework\Interception{closure}()
#15 /var/www/html/magento-site/generated/code/Magento/Customer/Model/ResourceModel/Customer/Interceptor.php(23): Magento\Customer\Model\ResourceModel\Customer\Interceptor->___callPlugins()
#16 /var/www/html/magento-site/vendor/magento/framework/Model/AbstractModel.php(663): Magento\Customer\Model\ResourceModel\Customer\Interceptor->save()
#17 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\Model\AbstractModel->save()
#18 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Customer\Model\Customer\Interceptor->___callParent()
#19 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Customer\Model\Customer\Interceptor->Magento\Framework\Interception{closure}()
#20 /var/www/html/magento-site/generated/code/Magento/Customer/Model/Customer/Interceptor.php(23): Magento\Customer\Model\Customer\Interceptor->___callPlugins()
#21 /var/www/html/magento-site/vendor/magento/module-customer/Model/ResourceModel/CustomerRepository.php(267): Magento\Customer\Model\Customer\Interceptor->save()
#22 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Customer\Model\ResourceModel\CustomerRepository->save()
#23 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Customer\Model\ResourceModel\CustomerRepository\Interceptor->___callParent()
#24 /var/www/html/magento-site/vendor/magento/module-customer/Model/Plugin/CustomerRepository/TransactionWrapper.php(44): Magento\Customer\Model\ResourceModel\CustomerRepository\Interceptor->Magento\Framework\Interception{closure}()
#25 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\Customer\Model\Plugin\CustomerRepository\TransactionWrapper->aroundSave()
#26 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Customer\Model\ResourceModel\CustomerRepository\Interceptor->Magento\Framework\Interception{closure}()
#27 /var/www/html/magento-site/generated/code/Magento/Customer/Model/ResourceModel/CustomerRepository/Interceptor.php(23): Magento\Customer\Model\ResourceModel\CustomerRepository\Interceptor->___callPlugins()
#28 [internal function]: Magento\Customer\Model\ResourceModel\CustomerRepository\Interceptor->save()
#29 /var/www/html/magento-site/vendor/magento/module-webapi/Controller/Rest/SynchronousRequestProcessor.php(95): call_user_func_array()
#30 /var/www/html/magento-site/vendor/magento/module-webapi/Controller/Rest.php(201): Magento\Webapi\Controller\Rest\SynchronousRequestProcessor->process()
#31 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Webapi\Controller\Rest->dispatch()
#32 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Webapi\Controller\Rest\Interceptor->___callParent()
#33 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Webapi\Controller\Rest\Interceptor->Magento\Framework\Interception{closure}()
#34 /var/www/html/magento-site/generated/code/Magento/Webapi/Controller/Rest/Interceptor.php(23): Magento\Webapi\Controller\Rest\Interceptor->___callPlugins()
#35 /var/www/html/magento-site/vendor/magento/framework/App/Http.php(116): Magento\Webapi\Controller\Rest\Interceptor->dispatch()
#36 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\Http->launch()
#37 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\Http\Interceptor->___callParent()
#38 /var/www/html/magento-site/vendor/magento/module-application-performance-monitor/Plugin/ApplicationPerformanceMonitor.php(38): Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception{closure}()
#39 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\ApplicationPerformanceMonitor\Plugin\ApplicationPerformanceMonitor->aroundLaunch()
#40 /var/www/html/magento-site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception{closure}()
#41 /var/www/html/magento-site/generated/code/Magento/Framework/App/Http/Interceptor.php(23): Magento\Framework\App\Http\Interceptor->___callPlugins()
#42 /var/www/html/magento-site/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http\Interceptor->launch()
#43 /var/www/html/magento-site/pub/index.php(30): Magento\Framework\App\Bootstrap->run()
#44 {main}
)

Creating the group via Admin / Customer Groups allows the group to be assigned to the customer via the API and admin

Expected result

Allow customer group created via API to be assigned to a customer

Actual result

Update customer via API returns Error 500
Update customer via Admin displays: [Customer ID: 2] We can't save the customer.

Additional information

No response

Release note

No response

Triage and priority

• 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 @prowebuk. Thank you for your report.
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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
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• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
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[prowebuk]

Fixed in 2.4.8-p1

[prowebuk]

Whilst 2.4.8-p1 now allows the API to add a customer group created by the API to a customer, the customer cannot purchase any products with the following front end message being displayed: We can't add this item to your shopping cart right now. and the following in the debug log:

[2025-07-02T09:20:31.472438+00:00] main.CRITICAL: InvalidArgumentException: is unknown type in /magento.site/vendor/magento/module-sales-rule/Model/Rule/Action/Discount/CalculatorFactory.php:51
Stack trace:
#0 /magento.site/vendor/magento/module-sales-rule/Model/RulesApplier.php(354): Magento\SalesRule\Model\Rule\Action\Discount\CalculatorFactory->create()
#1 /magento.site/vendor/magento/module-sales-rule/Model/RulesApplier.php(274): Magento\SalesRule\Model\RulesApplier->getDiscountData()
#2 /magento.site/vendor/magento/module-sales-rule/Model/RulesApplier.php(156): Magento\SalesRule\Model\RulesApplier->applyRule()
#3 /magento.site/vendor/magento/module-sales-rule/Model/Validator.php(407): Magento\SalesRule\Model\RulesApplier->applyRules()
#4 /magento.site/vendor/magento/module-sales-rule/Model/Quote/Discount.php(218): Magento\SalesRule\Model\Validator->process()
#5 /magento.site/vendor/magento/module-quote/Model/Quote/TotalsCollector.php(261): Magento\SalesRule\Model\Quote\Discount->collect()
#6 /magento.site/generated/code/Magento/Quote/Model/Quote/TotalsCollector/Interceptor.php(41): Magento\Quote\Model\Quote\TotalsCollector->collectAddressTotals()
#7 /magento.site/vendor/magento/module-quote/Model/Quote/TotalsCollector.php(156): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->collectAddressTotals()
#8 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Quote\Model\Quote\TotalsCollector->collect()
#9 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->___callParent()
#10 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->Magento\Framework\Interception{closure}()
#11 /magento.site/generated/code/Magento/Quote/Model/Quote/TotalsCollector/Interceptor.php(32): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->___callPlugins()
#12 /magento.site/vendor/magento/module-quote/Model/Quote.php(2041): Magento\Quote\Model\Quote\TotalsCollector\Interceptor->collect()
#13 /magento.site/generated/code/Magento/Quote/Model/Quote/Interceptor.php(743): Magento\Quote\Model\Quote->collectTotals()
#14 /magento.site/vendor/magento/module-checkout/Model/Cart.php(600): Magento\Quote\Model\Quote\Interceptor->collectTotals()
#15 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Checkout\Model\Cart->save()
#16 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Checkout\Model\Cart\Interceptor->___callParent()
#17 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Checkout\Model\Cart\Interceptor->Magento\Framework\Interception{closure}()
#18 /magento.site/generated/code/Magento/Checkout/Model/Cart/Interceptor.php(23): Magento\Checkout\Model\Cart\Interceptor->___callPlugins()
#19 /magento.site/vendor/magento/module-checkout/Model/AddProductToCart.php(88): Magento\Checkout\Model\Cart\Interceptor->save()
#20 /magento.site/vendor/magento/module-checkout/Model/AddProductToCart.php(68): Magento\Checkout\Model\AddProductToCart->add()
#21 /magento.site/vendor/magento/module-quote/Model/ResourceModel/LoadQuoteByIdMutex.php(51): Magento\Checkout\Model\AddProductToCart->Magento\Checkout\Model{closure}()
#22 /magento.site/vendor/magento/module-checkout/Model/AddProductToCart.php(46): Magento\Quote\Model\ResourceModel\LoadQuoteByIdMutex->execute()
#23 /magento.site/vendor/magento/module-checkout/Controller/Cart/Add.php(136): Magento\Checkout\Model\AddProductToCart->execute()
#24 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Checkout\Controller\Cart\Add->execute()
#25 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Checkout\Controller\Cart\Add\Interceptor->___callParent()
#26 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Checkout\Controller\Cart\Add\Interceptor->Magento\Framework\Interception{closure}()
#27 /magento.site/generated/code/Magento/Checkout/Controller/Cart/Add/Interceptor.php(23): Magento\Checkout\Controller\Cart\Add\Interceptor->___callPlugins()
#28 /magento.site/vendor/magento/framework/App/Action/Action.php(111): Magento\Checkout\Controller\Cart\Add\Interceptor->execute()
#29 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\Action\Action->dispatch()
#30 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Checkout\Controller\Cart\Add\Interceptor->___callParent()
#31 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Checkout\Controller\Cart\Add\Interceptor->Magento\Framework\Interception{closure}()
#32 /magento.site/generated/code/Magento/Checkout/Controller/Cart/Add/Interceptor.php(32): Magento\Checkout\Controller\Cart\Add\Interceptor->___callPlugins()
#33 /magento.site/vendor/magento/framework/App/FrontController.php(245): Magento\Checkout\Controller\Cart\Add\Interceptor->dispatch()
#34 /magento.site/vendor/magento/framework/App/FrontController.php(212): Magento\Framework\App\FrontController->getActionResponse()
#35 /magento.site/vendor/magento/framework/App/FrontController.php(146): Magento\Framework\App\FrontController->processRequest()
#36 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\FrontController->dispatch()
#37 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\FrontController\Interceptor->___callParent()
#38 /magento.site/vendor/magento/module-store/App/FrontController/Plugin/RequestPreprocessor.php(99): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}()
#39 /magento.site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch()
#40 /magento.site/vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(76): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}()
#41 /magento.site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch()
#42 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception{closure}()
#43 /magento.site/generated/code/Magento/Framework/App/FrontController/Interceptor.php(23): Magento\Framework\App\FrontController\Interceptor->___callPlugins()
#44 /magento.site/vendor/magento/framework/App/Http.php(116): Magento\Framework\App\FrontController\Interceptor->dispatch()
#45 /magento.site/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Framework\App\Http->launch()
#46 /magento.site/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\App\Http\Interceptor->___callParent()
#47 /magento.site/vendor/magento/module-application-performance-monitor/Plugin/ApplicationPerformanceMonitor.php(38): Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception{closure}()
#48 /magento.site/vendor/magento/framework/Interception/Interceptor.php(135): Magento\ApplicationPerformanceMonitor\Plugin\ApplicationPerformanceMonitor->aroundLaunch()
#49 /magento.site/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception{closure}()
#50 /magento.site/generated/code/Magento/Framework/App/Http/Interceptor.php(23): Magento\Framework\App\Http\Interceptor->___callPlugins()
#51 /magento.site/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http\Interceptor->launch()
#52 /magento.site/pub/index.php(30): Magento\Framework\App\Bootstrap->run()
#53 {main} {"exception":"[object] (InvalidArgumentException(code: 0): is unknown type at /magento.site/vendor/magento/module-sales-rule/Model/Rule/Action/Discount/CalculatorFactory.php:51)"} []

[prowebuk]

Turns out the issue was with creating a cart price rule via the API which was missing "simple_action"=>"by_percent", from the payload.