This GitHub Expo issue conversation seems to indicate that KeyStore only allows "strong biometric" authentication: https://github.com/expo/expo/issues/26615

But the Android documentation seems to indicate that "lock screen credentials" can be used: https://developer.android.com/privacy-and-security/keystore#UserAuthentication

The latter is supported by certain apps that appear to use non-"strong" biometric methods like Phantom. My assumption is that this "lock screen credentials" option can be exposed via SecureStore.