One of the problems with the NAB app is that they block you if you're using a VPN despite advice from the Australian Cyber Security Centre to use a VPN. Had to update other the weekend after trying to access and it was only by chance that a posted review of the app on Play Store raised the issue of a VPN. Even accessing the web site using a VPN would not work. Of course, NAB doesn't mention anything about use of a VPN, and their stupid replies to complaints on Play Store saying..contact us via social media says a lot. Don't and won't do social media. They now want a lot more permissions such as bluetooth, location etc etc etc
So...ATM to access I have to disconnect VPN, reboot and then log in. It does work with grapheneOS but no VPN. However, if you then reconnect VPN you still get notifications which is OK seeing that it tells me what's coming in and going out from my accounts.