从Magenro 1.9迁移到Magento 2.3.3后，我遇到了这个问题，对我来说，这种方法是有效的：在mysql命令行上运行
从eav属性中选择属性标识、属性代码，其中属性代码=“名字”;
它会这样显示

然后运行以下查询，不要忘记根据您的终端更改attribute_id：

INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('adminhtml_checkout', '5');
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('adminhtml_customer_address', '5');
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('adminhtml_customer_address', '20'); 
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('customer_address_edit', '5'); 
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('customer_address_edit', '20');
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('customer_register_address', '20'); 
INSERT INTO `customer_form_attribute` (`form_code`, `attribute_id`) VALUES ('customer_register_address', '5');

我刚刚在从1.9迁移到2.4.3后遇到了这个问题。
我的解决方案是备份 customer_form_attribute 表并将其截断（删除所有数据）。

mysql> create table customer_form_attribute_bkup select * from customer_form_attribute;
mysql> truncate customer_form_attribute;

然后我把我从 vendor/magento/module-customer/Setup/Patch/Data/DefaultCustomerGroupsAndAttributes.php 中提取/修改的以下代码放到我的Magento 2安装的根目录下的一个文件中并运行它。
customer_form_attribute表被重新构建，之后一切正常。

<?php

require __DIR__ . '/app/bootstrap.php';
$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);
$app = $bootstrap->createApplication(\Magento\Framework\App\Http::class);

$objManager = \Magento\Framework\App\ObjectManager::getInstance();
$logger = $objManager->get(\Psr\Log\LoggerInterface::class);

$moduleDataSetup = $objManager->get('Magento\Framework\Setup\ModuleDataSetupInterface');
$customerSetupFactory = $objManager->get('Magento\Customer\Setup\CustomerSetupFactory');
$customerSetup = $customerSetupFactory->create(['setup' => $moduleDataSetup]);
$customerSetup->installCustomerForms();