Postcode lookup from the Configuration Task no longer works without modification - Google changed they way they handle usage of the Google Maps API to a paid model (with $200 free usage per month). So you need to get an API key from Google then update the code to pass the API key as well as use HTTPS. I provided more details about this previously along with some sample code here:
Also, AFAIK in Australia (as compared to the UK), zip codes do not give street level data, so you won’t get the same level of accuracy as for the UK. So you can change country code to AU and get part of the address but you will then need to enter the rest.
Another option is you look at integrating another Postcode lookup API, but that is another topic in itself, and also any such APIs are not going to be free, typically pay per use, so may not be suitable to your needs - unless of course zip code data is freely available in Australia and then therefore you could in theory create your own lookup by storing the zip code data in a database table (I have done this for a client based in Jersey where Google Maps is not accurate).