Failed authentication events are crucial for maintaining security and user experience in applications. WorkOS provides various failed authentication events such as authentication.sso_failed, authentication.oauth_failed, authentication.password_failed, and authentication.magic_auth_failed. These events can be used to implement features like blocking login after X failed attempts, monitoring for errors in connections, and more. Developers can get these failed authentication events using the Events API, webhooks, or by streaming them to Datadog. Proper data reconciliation is also important to ensure that your app's state remains consistent with WorkOS.