Unfortunately, this is probably because of the apps started using the Play Integrity API, which is a hardware-based attestation and can only be faked in two ways that GrapheneOS isn’t interested in:
you can fake an older device that didn’t support hardware attestation yet, or had a broken implementation
or you can try getting leaked vendor keys and emulate the crypto with those until they get revoked
Unfortunately, this is probably because of the apps started using the Play Integrity API, which is a hardware-based attestation and can only be faked in two ways that GrapheneOS isn’t interested in: