MC1189663 | (Updated) Retirement of external access token for actionable messages – moving to Microsoft Entra authentication

Service

Microsoft 365 apps

Last Updated

2026-05-21T17:04:16.13Z

Published

2025-11-25T00:05:43Z

Message ID

MC1189663

Updated May 21, 2026: Phasing out to Legacy Auth Token (EAT) has been initiated and will complete by June 8th 2026. Thank you for your patience. [Introduction] We’re retiring the use of external access tokens for actionable messages and transitioning to Microsoft Entra-based authentication. This update enhances security and aligns with modern identity standards, providing a more robust and compliant experience for actionable messages. [When this will happen] This change takes effect on May 15, 2026. After this date, external access tokens will no longer be supported. [How this affects your organization] Who is affected: Organizations using actionable messages that currently rely on external...

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