Outlook for the web's migration to MSAL may cause sign-in prompts due to third-party cookie blocks in Chrome and Edge. Users without device SSO might see a red banner or dialog box requesting re-authentication. Rollout begins late November 2024, with preparations advised for enterprise administrators.
Applies to: Exchange Online · Microsoft 365 for the web
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).