@Override
    public boolean isYubiKeyRegisteredFor(final String uid, final String yubikeyPublicId) {
        return false;
    }
This is {@link ClosedYubiKeyAccountRegistry}.

@author Misagh Moayyed
@since 5.2.0
support/cas-server-support-yubikey-core/src/main/java/org/apereo/cas/adaptors/yubikey/registry/ClosedYubiKeyAccountRegistry.java