Outage in Affinity
Authentication Issues with Windows Outlook Desktop App
Resolved MinorIncident Report
Summary AI Generated
SSO login to the Affinity Outlook Add-in on Windows was broken for approximately 23 days due to a Microsoft-side change affecting how Windows Outlook handles authentication redirects. Mac Outlook and the Affinity web application remained fully functional throughout, serving as a workaround. The issue was resolved by requiring affected customers to update their ACS URL and set the SSO Callback Style property to "Login host, direct (circa 2026)."
Some users on Windows Outlook Desktop App are unable to complete SSO login to the Affinity Outlook Add-in. This is due to a recent change on Microsoft's end affecting how Outlook on Windows handles authentication redirects. Mac Outlook is unaffected. As a workaround, users can access Affinity via the web application.
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Latest Updates ( sorted recent to last )
RESOLVED
about 1 month ago - at 07/23/2026 03:03PM
This issue has been resolved now. Customers who were impacted will need to update their ACS URL to https://login.affinity.co/auth/{subdomain}/sso/saml-callback and set the SSO Callback Style property to "Login host, direct (circa 2026)" to opt in to the fix. The web application and Mac Outlook were unaffected throughout.
Customers needing help can contact Affinity support at support@affinity.co.
IDENTIFIED
about 1 month ago - at 07/10/2026 08:28PM
We are investigating an update to the Affinity platform that will work around the issue caused by Microsoft's recent change and restore SSO login behavior for Windows Outlook Desktop App users. Mac Outlook and the Affinity web application are unaffected and can be used as a workaround in the interim.
IDENTIFIED
about 2 months ago - at 06/30/2026 04:06PM
Some users on Windows Outlook Desktop App are unable to complete SSO login to the Affinity Outlook Add-in. This is due to a recent change on Microsoft's end affecting how Outlook on Windows handles authentication redirects. Mac Outlook is unaffected. As a workaround, users can access Affinity via the web application.
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