Multi tool use

Magento 2 - Adding custom fields to customer registration form?

I am needing to add a few custom fields to the customer registration form within Magento 2.

The fields I need to add are:

Company Registration Number, Business Type (Which will be a select list) and Sage Account Number

I've looked at a few resources and attempted to setup a customer attribute but I haven't had much luck.

This is my code so far in InstallData.php:

InstallData.php

public function __construct(CustomerSetupFactory $customerSetupFactory) {
$this->customerSetupFactory = $customerSetupFactory;
}

public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context) {
$eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
$eavSetup->addAttribute(
MagentoCustomerModelCustomer::ENTITY,
'company_reg_number',
[
'type' => 'varchar',
'label' => 'Comapny Registration Number',
'input' => 'text',
'required' => true,
'visible' => true,
'user_defined' => true,
'position' => 999,
'system' => 0,
]
);

$companyRegNo = $this->eavConfig->getAttribute(Customer::ENTITY, 'company_reg_number');
// more used_in_forms ['adminhtml_checkout','adminhtml_customer','adminhtml_customer_address','customer_account_edit','customer_address_edit','customer_register_address']
$companyRegNo->setData(
'used_in_forms',
['adminhtml_customer']
);

$companyRegNo->save();
}


I expect to see a new field called Company Registration Number in the backend customer section here:

Customer Account Information backend page

Not sure if I'm missing something?

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