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

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

Message ID: MC1189663 (Updated) 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…