Excel Power Query is updating its authentication flow for Organizational Accounts (Microsoft Entra ID) to enhance security and reliability. Users on Excel 2021 version 21.08 or older must update to build 16.0.14334.20754 or later by July 24, 2026, or upgrade to a newer version to avoid authentication loss. Microsoft 365 and newer Excel versions are unaffected.
Applies to: Microsoft 365 apps
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).