According to Osho, you have not failed—and cannot fail—him, because he gives no commandments or superhuman ideals to betray. Unlike prophets who impose expectations, he expects nothing; therefore you cannot go against him. Your responsibility is to fulfill your own being, not his idea. His speaking invites self-understanding, not obedience, so no failure compels him to speak again.
No, you haven’t failed Osho—he sets no rules to break; just be yourself and grow in your own way.