Single Sign-On Configuration Errors

Problem

While attempting to use WHMCS single sign-on to authenticate, users see the following error:

Single Sign-On authentication denied per configuration for User ID: xx

Cause

This error occurs when single sign-on access is disabled in the client’s security settings. Users can disable single sign-on access to their accounts at any time through their Client Area security settings.

Solution

To resolve this error, the client must re-enable single sign-on in their security settings:

  1. Log in to the WHMCS Client Area.
  2. Navigate to Account > Security Settings.
  3. Enable single sign-on.
  4. Save the changes.
troubleshooting troubleshooting-article single-sign-on authentication

Last modified: 2025 August 6