O atributo do cliente não aparece no adminhtml formulário da conta do cliente no Magento Enterprise 2.2.0

Eu criei o módulo "Wgac_Subscription". Eu quero criar atributo de cliente personalizado. Ele está listado em admin, como mostra a imagem abaixo, mas não é exibido no formulário adminhtml do cliente.

Wgac / Subscription / Setup / InstallData.php

<?php
namespace Wgac\Subscription\Setup;

use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Customer\Model\Customer;
use Magento\Customer\Setup\CustomerSetupFactory;
use Magento\Eav\Model\Entity\Attribute\Set as AttributeSet;
use Magento\Eav\Model\Entity\Attribute\SetFactory as AttributeSetFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
    private $eavSetupFactory;

    /**
     * @var CustomerSetupFactory
     */
    protected $customerSetupFactory;

    /**
     * @var AttributeSetFactory
     */
    private $attributeSetFactory;



    public function __construct(
        EavSetupFactory $eavSetupFactory,
        CustomerSetupFactory $customerSetupFactory,
        AttributeSetFactory $attributeSetFactory
    )
    {
        $this->eavSetupFactory = $eavSetupFactory;
        $this->customerSetupFactory = $customerSetupFactory;
        $this->attributeSetFactory = $attributeSetFactory;

    }

    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
    /*
        **
        * Create  Customer Attribute "customer_chargify_id"
        ** ==== START ====
        */

         /** @var CustomerSetup $customerSetup */
        $customerSetup = $this->customerSetupFactory->create(['setup' => $setup]);

        $customerEntity = $customerSetup->getEavConfig()->getEntityType('customer');
        $attributeSetId = $customerEntity->getDefaultAttributeSetId();

        /** @var $attributeSet AttributeSet */
        $attributeSet = $this->attributeSetFactory->create();
        $attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);

        $customerSetup->addAttribute(Customer::ENTITY, 'customer_chargify_id', [
            'type' => 'varchar',
            'label' => 'Customer Chargify Id',
            'input' => 'text',
            'required' => false,
            'visible' => true,
            "unique"  => true,
            'user_defined' => true,
            'position' =>999,
            'system' => 0,
        ]);

        $attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'customer_chargify_id')
        ->addData([
            'attribute_set_id' => $attributeSetId,
            'attribute_group_id' => $attributeGroupId,
            'used_in_forms' => ['adminhtml_customer'],//you can use other forms also ['adminhtml_customer_address', 'customer_address_edit', 'customer_register_address']
        ]);

        $attribute->save();

        /*        
        *   === END ===       
        */



    }
}

Wgac / Subscription / view / base / ui_component / customer_form.xml

<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_con
figuration.xsd">
    <fieldset name="customer">
        <field name="customer_chargify_id">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="dataType" xsi:type="string">text</item>
                    <item name="formElement"
                    xsi:type="string">input</item>
                    <item name="source"
                    xsi:type="string">customer</item>
                </item>
            </argument>
        </field>
    </fieldset>
</form>

Por favor, sugira-me se estiver faltando alguma coisa.

O valor de 'used_in_forms' deve ser ['adminhtml_customer', 'customer_account_edit'] . Se você não deseja que esse atributo seja exibido para um cliente, defina visible = false . Você pode atualizar seu InstallData como abaixo:

$customerSetup->removeAttribute(Customer::ENTITY, 'customer_chargify_id');
$customerSetup->addAttribute(Customer::ENTITY, 'customer_chargify_id', [
            'type' => 'varchar',
            'label' => 'Customer Chargify Id',
            'input' => 'text',
            'required' => false,
            'visible' => false,
            "unique" => true,
            'user_defined' => true,
            'position' => 999,
            'system' => 0,
        ]);

        $attribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'customer_chargify_id')
            ->addData([
                'attribute_set_id' => $attributeSetId,
                'attribute_group_id' => $attributeGroupId,
                'used_in_forms' => ['adminhtml_customer', 'customer_account_edit'],
            ]);

E certifique-se de ter excluído YourVendor_YourModule na tabela setup_module se desejar executar novamente o script InstallData

Espero que isso ajude você

Saudações