Zend certified PHP/Magento developer

Error applying coupon at checkout

Error Coupon

{"message":"The coupon code isn't valid. Verify the code and try again.","trace":"#0 [internal function]: Magento\Quote\Model\CouponManagement->set()n#1 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/module-webapi/Controller/Rest/SynchronousRequestProcessor.php(95): call_user_func_array()n#2 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/module-webapi/Controller/Rest.php(188): Magento\Webapi\Controller\Rest\SynchronousRequestProcessor->process()n#3 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/framework/Interception/Interceptor.php(58): Magento\Webapi\Controller\Rest->dispatch()n#4 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Webapi\Controller\Rest\Interceptor->___callParent()n#5 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Webapi\Controller\Rest\Interceptor->Magento\Framework\Interception\{closure}()n#6 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/generated/code/Magento/Webapi/Controller/Rest/Interceptor.php(23): Magento\Webapi\Controller\Rest\Interceptor->___callPlugins()n#7 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/framework/App/Http.php(116): Magento\Webapi\Controller\Rest\Interceptor->dispatch()n#8 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/vendor/magento/framework/App/Bootstrap.php(264): Magento\Framework\App\Http->launch()n#9 /var/www/workspaces/marcelo.caetano/projetos/supermercado-escola/pub/index.php(29): Magento\Framework\App\Bootstrap->run()n#10 {main}"}

This is the site in production: https://sitenovo.supermercadoescola.org.br/

Magento 2.4.3
php7.4-fpm
Apache 2.4
Debian 8