---
title: "8x8 Contact Center Agent Desktop Single Sign On Failed"
slug: "8x8-contact-center-agent-desktop-single-sign-on-failed"
updated: 2026-05-19T11:56:22Z
published: 2026-05-21T21:26:15Z
canonical: "help.8x8.com/8x8-contact-center-agent-desktop-single-sign-on-failed"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.8x8.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 8x8 Contact Center Agent Desktop Single Sign On Failed

## Symptom

Users in Agent Workspace get an error message that reads, *"The single sign on failed. If problem persists, please contact your administrator for further assistance."*

- User's SSO login works.
- In the 8x8 Application Panel, select Contact Center Agent Workspace.
- With a new browser tab open for Agent Workspace, you see the error message, "The single sign on failed. If problem persists, please contact your administrator for further assistance."
- Other users can access Agent Workspace without error.

## Applies To

- Agent Workspace

## Resolution

The user's IP address needs to be added to the allowed IP address list.

1. Log in to Configuration Manager for Contact Center.
2. Select **Security**.
3. Select **IP Address Restriction**.
4. Adjust the existing allowed IP addresses, or **Add Allowed IP Range**.

## Cause

The affected user's IP address has not been allowed.

## Additional Information

For more details see the following documentation:

- [Enhanced System Access Authentication](https://docs.8x8.com/vcc-8-1-ProductDocumentation/WebHelpConfigurationManager/content/8_1_6release/ipwhitelisttenantaccess.htm)
- [Authorize IP Access via Email](/documentation/docs/8-1-6release-authorize-ip-access-via-email)