How can I use the username and email address as a login for Joomla?
The answer is YES; Both you can use the username and email address to log in for your Joomla 4 and Joomla 5 in the frontend or users login. Here are the things you need to install to make this possible work both username and email addresses to login in to your Joomla 4 and Joomla 5 websites.
This extension will support all types of thrid party extensions that you have in your Joomla such as e-commerce extension (HikaShop, Virtuemart, Eshop, J2store, Payplans, Membership pro, Joomdonation, Jcart for Opencart, and many more)
This extension is called - User Email login which you can find in Joomla extension directory.
Or you can download it directly to our extension page website - https://wedevlops.com/developers-shop/product/129-email-login-joomla.html
You can check the video tutorial on YouTube