Are you currently in Australia ? To use the Australian store you need to be in Australia with an Australian billing address on your account. If you are here in the UK you could try contacting the developer and ask them to put in the UK store
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Question: I had an app linked to Virgin Australia but it stopped working and requested me to enter my password. This was entered correctly was rejected each time. So l deleted the app. Then tried to reload from Apple Store but was rejected because my Apple.