Ok some progress. After a social media request, somebody called me this afternoon to verify some details. Basically said it was all correct (they thought my drivers licence number might have been wrong or something) and they have no idea why it wasn't identifying me. Said to go into a branch and fill out a paper application.
Haven't got the time to do that, so I thought I'd try the online process over again but use my passport and medicare card. That seemed to work and it came up "conditionally approved" and sent me to a portal to upload payslips. There hasn't been a ping on my credit file as yet (that I have been notified of anyway).
For those who had issues with questions about previous card applications etc etc, did you get to this "conditional approval" stage? Or did they interrogate you prior to that?
Better half had the same result and uploaded payslips on Monday, but haven't heard or seen an update as yet.