Your account is not valid for use in the US store. You must switch to the Australian store

Change to Australian App Store

1. Tap "Settings"

2. Tap "iTunes & App Stores"

3.Tap "View Apple ID"

4. Enter your user name and password.

5. Tap "Country/Region."

6. Tap "Change Country/Region"

7. Select the region where you are located.

8. Tap "Done".

You are most welcome 🙂