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How to Fix Undefined Sign-On URL Error in Outlook Email
Question details
The user needs to resolve an error stating that the Email application has an undefined sign-on URL.
- Product
- Microsoft Outlook / Microsoft Entra ID
- Device & OS
- not provided
- Scenario
- Attempting to sign in to an enterprise email application connected to Microsoft Entra ID.
- Observed behavior
- An error message is displayed indicating an undefined sign-on URL, which prevents the user from accessing their email account.
Verify whether this sign-in issue occurs in the Outlook desktop application, Outlook on the web, or both, as this will help your IT administrator diagnose the scope of the problem.
Contact Your IT Administrator to Update Entra ID Configurations
Use this solution to provide your organization's IT department with the correct details to resolve the server-side configuration issue.
The 'undefined sign-on URL' error is almost always caused by a misconfiguration within Microsoft Entra ID (formerly Azure AD). Because this is a server-side enterprise issue, running a local Office repair tool on your computer will not resolve the problem.
Take a screenshot of the exact error message and note whether you are experiencing the issue on the web browser, the desktop app, or mobile devices.
Submit a support ticket or contact your organization's IT or Microsoft Entra administrator directly.
Ask the administrator to verify the enterprise application's sign-on URL, user assignment, account status, and sign-in configuration within the Microsoft Entra admin center.
Maintain Productivity with WPS Office During IT Downtime
While you wait for your IT department to resolve complex Microsoft Entra ID configurations, keep your daily tasks moving. WPS Office is a highly compatible, free alternative to Microsoft Office that lets you edit documents locally without relying on enterprise server setups.
- 1. Download the software: Visit the official WPS Office website and click the download button for your operating system.
- 2. Install quickly: Run the lightweight installer, which sets up in minutes without conflicting with your existing software.
- 3. Open Office files directly: Launch WPS Office and instantly open your existing .docx, .xlsx, or .pptx files to continue working offline.
Frequently Asked Questions
What does 'undefined sign-on URL' mean in Outlook?
This means that the enterprise email application registered in your organization's Microsoft Entra ID (Azure AD) is missing a valid URL required to redirect users during the authentication process.
Can I fix this error by repairing Microsoft Office?
No. Repairing or reinstalling your local Microsoft Office applications will not fix the issue, as the error originates from your company's server-side authentication configurations, not your local files.
Who can resolve the undefined sign-on URL error?
Only an IT professional or a Microsoft Entra administrator with the necessary privileges in your organization can update the enterprise application settings to resolve this.
