when I select private registration then add to checkout, it works but as soon as I click on the actual checkout button in the popup window nothing happens and when i go back to navigate to the cart it's empty.
Hi @misswenchy. Welcome to GoDaddy Community!
Sorry for any confusion. Private Registration and Protected Registration are not available for .au domain names. That's why you're not able to check out. This restriction is in place by the AU domain registry. You can read more about their policy here.