show tax/VAT number in registration form in Magento 2. Check the method for the same below:
Steps to Show Tax/VAT Number in Registration Form in Magento 2:

- Login to Magento 2 admin panel
- Navigate to Stores > Settings > Customers
- Under Customer, select Customer Configuration
- Expand Name and Address Options
- Set Required in the field “Show Tax/VAT Number”
- Save the configuration
