Here’s a crowd-sourced list of international banking apps that are compatible with GrapheneOS:
https://privsec.dev/posts/android/banking-applications-compatibility-with-grapheneos/
The issue tracker has slightly more current banking app reports:
https://github.com/PrivSec-dev/banking-apps-compat-report
Some banking apps may be problematic and here are some possible workaround solutions:
https://discuss.grapheneos.org/d/8330-app-compatibility-with-grapheneos
No issues with running the RSA Authenticator (SecurID) app on both the Pixel 6 and 8 on the latest Android 14 build of GrapheneOS.
See previous reply for details as to why it wasn’t working for non-GrapheneOS users as well - over a year ago is when it started being problematic.