On March 10, 2026, Microsoft’s routine Patch Tuesday update KB5079473 rolled out automatically to Windows 11 devices on versions 24H2 and 25H2. The update patched 79 security vulnerabilities — including two publicly disclosed zero-days — and brought Emoji 16.0 support and a Bing-powered taskbar speed test shortcut. It also unintentionally broke Microsoft account sign-ins across a wide range of apps.
Users began reporting a persistent “You’ll need the Internet for this. It doesn’t look like you’re connected to the Internet” error inside Teams, OneDrive, Edge, Excel, Word, PowerPoint, and Copilot — even on devices with a fully working internet connection. The apps still opened, but any feature requiring a Microsoft account sign-in — cloud sync, templates, fonts, communications — stopped working.
Microsoft officially confirmed the issue on March 20 via its Windows Release Health dashboard and released an emergency out-of-band fix — KB5085516 — on March 21, 2026. The update is available now but does not install automatically unless the “Get latest updates as soon as they’re available” toggle is on in Windows Update settings.
A Routine Security Patch That Broke Sign-Ins
Key facts about the bug and its fix, verified against Microsoft’s official KB5085516 support page.
Which Apps Were Hit — and Which Were Not?
The bug affects any app using a personal Microsoft account for sign-in. Apps still open, but online features, cloud sync, and anything needing account authentication fail with the false “no internet” error.
Eleven Days From Bug to Fix
The full sequence of events from the March 2026 Patch Tuesday rollout to the emergency KB5085516 release, as documented by Microsoft.
KB5079473 rolls out automatically
Microsoft’s March 2026 Patch Tuesday update installs on Windows 11 24H2 and 25H2 devices. It patches 79 vulnerabilities including two publicly disclosed zero-days — CVE-2026-21262 in SQL Server and CVE-2026-26127 in .NET — and adds Emoji 16.0, improved File Explorer search reliability, and a Bing-based taskbar speed test shortcut. The security update installs automatically on most consumer devices.
Sign-in failures spread across Microsoft apps
Users encounter a persistent error — “You’ll need the Internet for this. It doesn’t look like you’re connected to the Internet” — even on devices with a working connection. The update places the device in a specific network connectivity state that blocks Microsoft account authentication. Changing DNS, using a VPN, or reinstalling apps does not help, as the bug affects the Windows installation itself.
Microsoft officially acknowledges the bug
Microsoft documents the issue on its Windows Release Health dashboard and issues a temporary workaround: restart the affected device while connected to the internet. Microsoft warns the device may return to the broken state if restarted offline. Entra ID sign-ins are confirmed unaffected.
Emergency update KB5085516 released
Microsoft releases a cumulative out-of-band fix for Windows 11 25H2 and 24H2. OS builds advance to 26200.8039 (25H2) and 26100.8039 (24H2). Available via Windows Update under Optional Updates and the Microsoft Update Catalog. Devices with “Get the latest updates as soon as they’re available” enabled receive it automatically; others must install manually.
Do You Need to Install KB5085516?
Not every Windows 11 user is affected. Answer two quick questions to find out whether you need to act — and get your exact next steps if you do.
How to Install the Fix Manually
Stay connected to the internet throughout. Restarting offline can return the device to the broken state. The full process takes approximately 12 minutes.
Win + IThe Third Emergency Patch in March 2026
KB5085516 is not March’s only out-of-band update. Two earlier emergency patches preceded it for Windows 11 Enterprise environments.
RRAS Security Hotpatch
Fixed three critical remote code execution vulnerabilities — CVE-2026-25172, CVE-2026-25173, CVE-2026-26111 — in the Routing and Remote Access Service (RRAS). Targeted at hotpatch-enabled Windows 11 Enterprise and LTSC 2024 devices only. Standard consumer devices were already covered by the March Patch Tuesday.
Bluetooth Connectivity Fix
Addressed Bluetooth device visibility issues on hotpatch-enabled Windows 11 Enterprise LTSC 2024 devices only. This fix does not apply to standard consumer Windows 11 installs.
C:\ Drive Access Failure
Microsoft published separate guidance for Windows 11 users on select Samsung laptops unable to access their C:\ drive. The cause was a faulty version of the Samsung Galaxy Connect (Samsung Continuity Service) app — unrelated to KB5079473 or the sign-in bug.
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What Was Covered
The update KB5085516 was discussed as Microsoft’s out-of-band response to a sign-in failure introduced by the March 2026 Patch Tuesday release KB5079473. The bug was documented as affecting personal Microsoft account authentication across Teams Free, OneDrive, Edge, Excel, Word, PowerPoint, and Copilot on Windows 11 versions 24H2 and 25H2.
The fix was covered as an optional update released on March 21, 2026 — eleven days after the problematic patch. It was noted as available via Windows Update’s Optional Updates section and the Microsoft Update Catalog. Entra ID-based business sign-ins were confirmed as unaffected throughout.
The March 2026 Patch Tuesday cycle, the sign-in disruption, the temporary workaround, and the KB5085516 emergency fix were covered as documented in Microsoft’s official Windows Release Health dashboard.
