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.
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
The repos issue tracker is slightly more up to date.
There are some banking apps and apps in general that may be problematic. For such cases, here are the possible work around solutions.