This issue has been resolved now. Customers who were impacted will need to contact Affinity support at support@affinity.co for config change instructions.
Posted Jul 23, 2026 - 08:00 PDT
Update
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.
Posted Jul 10, 2026 - 13:28 PDT
Identified
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.
Posted Jun 30, 2026 - 09:06 PDT
This incident affected: Extensions (Affinity for Outlook).