'%3e%3cpath%20d='M8%200C12.4183%200%2016%203.58172%2016%208C16%2012.4183%2012.4183%2016%208%2016C3.58172%2016%200%2012.4183%200%208C0%203.58172%203.58172%200%208%200ZM11.6162%204.38379C11.2257%203.99337%2010.5927%203.99338%2010.2021%204.38379L8%206.58594L5.79785%204.38379C5.40732%203.99334%204.77429%203.99329%204.38379%204.38379C3.99331%204.77429%203.99335%205.40733%204.38379%205.79785L6.58594%208L4.38379%2010.2021C3.99348%2010.5927%203.99341%2011.2257%204.38379%2011.6162C4.77426%2012.0066%205.40734%2012.0065%205.79785%2011.6162L8%209.41406L10.2021%2011.6162C10.5927%2012.0066%2011.2257%2012.0067%2011.6162%2011.6162C12.0067%2011.2257%2012.0066%2010.5927%2011.6162%2010.2021L9.41406%208L11.6162%205.79785C12.0066%205.40735%2012.0066%204.77429%2011.6162%204.38379Z'%20fill='%23080E17'%20fill-opacity='0.46'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_3761_713'%3e%3crect%20width='16'%20height='16'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
Fix Outlook Desktop Web Viewer Taking Over Salesforce Inbox Login
Question details
A user is unable to log into the Salesforce Inbox Outlook add-in because the authentication process is incorrectly intercepted by the Windows Desktop App Web Viewer.
- Product
- Microsoft Outlook, Salesforce Inbox Add-in
- Device & OS
- Windows
- Scenario
- Attempting to log into the Salesforce Inbox add-in within Microsoft Outlook using an organization's custom-domain single sign-on (SSO).
- Observed behavior
- The add-in opens the Windows Desktop App Web Viewer instead of redirecting the custom-domain login to the organization's SSO authentication portal.
Verify that your Microsoft Edge WebView2 Runtime and Outlook application are fully updated, and ensure your SSO credentials work properly when logging in through a standard web browser.
Submit a Service Request via Microsoft 365 Admin Center
Since this routing issue is often isolated to specific WebView settings or enterprise authentication configurations, an IT administrator must escalate it to Microsoft Support.
Because this behavior involves an enterprise add-in and is limited to specific user device configurations, it requires a backend investigation of Outlook, WebView, and single sign-on (SSO) settings. Standard client-side troubleshooting is rarely sufficient for custom-domain redirect failures.
Ask the affected user to record a video or capture sequential screenshots of the complete login process, demonstrating the Web Viewer taking over instead of routing to the SSO system.
Document the affected user's Windows operating system version, the exact Microsoft Outlook build version, and the specific authentication steps being used.
Log into the Microsoft 365 Admin Center using an IT administrator account.
Navigate to 'Support' and select 'New service request'. Provide the collected details, video/screenshots, and specify that the Desktop Web Viewer is intercepting a Salesforce Inbox SSO redirect.
Experience a Seamless and Lightweight Office Suite Alternative
While managing complex enterprise add-in and SSO configurations in Microsoft Office can be challenging, having a reliable daily driver is essential. WPS Office offers a powerful, lightweight alternative, providing excellent compatibility and a smooth user experience without the heavy background processes.
- 1. Download WPS Office: Visit the official WPS Office website and click the free download button tailored for your operating system.
- 2. Install the Application: Run the downloaded setup file and follow the simple on-screen instructions to complete the installation.
- 3. Start Working: Open WPS Office and instantly access Writer, Spreadsheet, and Presentation tools within one unified workspace.
Frequently Asked Questions
Why does Outlook use Web Viewer for the Salesforce add-in?
Modern Outlook add-ins utilize web-based frameworks like Microsoft Edge WebView2 to render interfaces and handle authentication. Occasionally, strict security policies or caching errors in WebView prevent it from properly redirecting to external SSO pages.
Is there a temporary workaround for this SSO login issue?
Yes, affected users can temporarily access their email via Outlook on the Web (OWA) using a standard web browser like Chrome or Edge. The Salesforce Inbox add-in typically processes SSO redirects normally in the web version.
Can clearing the Web Viewer cache fix the login problem?
It might help clear corrupted session data. You can clear the WebView cache by navigating to '%LOCALAPPDATA%\Microsoft\Office\16.0\Wef' in your Windows File Explorer and deleting the folder contents before restarting Outlook.
