Other European banks do it, too - N26 also rejects GrapheneOS.
Fwiw, also for me N26 works, have had the account for years now, but installed the app a couple of weeks ago (when I got my Pixel 10 with GOS.)
Maybe during registration, but not during use.
N26 works fine on GrapheneOS for me.... but I see there's a note saying:
> This app has started using Play Integrity to block new signups, existing accounts continue to work fine for now.
https://privsec.dev/posts/android/banking-applications-compa...