If you haven't already done so, you will want to reach out to our live support so they can help investigate further. If the domain was recently purchased, it may be in a pending registration status which prevents use of the domain till it is finally resolved. With a .COM.AU domain, this can sometimes be prolonged if inaccurate or incomplete information was entered during the registration process.
Our support team should be able to help walk you through getting it corrected if that is the case.
CG - GoDaddy | Community Moderator 24/7 support available at x.co/247support