Exporting to GBXML

We are just starting to get into exporting our Bentley Architecture models in GBxml to look at them in TAS.

Having a problem with the export process.

Seems to go through all the steps fine but when it comes entering the ZIP / PIN Code it will not accept anything we key in.

Therefore we can not export.

Working in Sydney in Australia.

Does anyone know where we can get ZIP /PIN codes that the export process will accept? as it does not accept out standard zip codes