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...

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.