Troubleshoot Log Event Codes
Post-login Actions and Social connections
If you have configured a post-login Action and a Social connection (such as Facebook) on your tenant, you may encounter the following issue.
When a user signs up on a Social connection and your post-login Action fails for that authentication flow, Auth0 logs a "Failed Signup" (fs) event. However, Auth0 does create a user profile for this user.
Subsequently, when the user logs in on that Social connection, Auth0 logs a "Success Login" (s) event.