If you own a 3rd level .au domain that you plan to use as base for a priority application, check the registrant details and make sure they are accurate and up-to-date.
If you own the same domain/keyword in multiple 3rd level .au extensions (example .COM.au, .ORG.au), make sure they all have the same registrant details so contention sets will be solved faster. You don't want to end up fighting yourself!
Once you submit your .au application you will be unable to update the registrant information associated with your existing 3rd level domain name while your application is active. It is important to make sure it is up to date before you submit your application.
If the domain you want in .au is not registered in any 3rd level .au domain today, register in COM.au now, so you automatically get a right to the name in March 2022.