It's really a downside of the Google app ecosystem and not GrapheneOS per se, but apps requiring higher levels of integrity per Google attestation (Play Integri

It's really a downside of the Google app ecosystem and not GrapheneOS per se, but apps requiring higher levels of integrity per Google attestation (Play Integrity/SafetyNet) generally won't work. Intentionally breaking apps on "untrusted" configurations is basically the point of that feature, and GrapheneOS does provide the relevant services, but would need to be specifically enabled by the app developer.