Microsoft account sign-in failures triggered by KB5079473 Windows 11 update
Summary
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Microsoft reports that the March Windows 11 KB5079473 cumulative update disrupts sign-in operations for Microsoft accounts across multiple applications, including Teams, OneDrive, Microsoft Edge, Excel, Word, and Microsoft 365 Copilot. The issue causes affected systems to display an error message falsely indicating a lack of internet connectivity even when a device is online. The disruption primarily impacts consumer Microsoft accounts and not Entra ID (formerly Azure Active Directory) authentication used in enterprise environments.
Timeline
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20.03.2026 09:33 1 articles · 3h ago
KB5079473 update disrupts Microsoft account sign-ins across multiple applications
Microsoft account sign-in failures began appearing after the installation of KB5079473 cumulative update released on March 11, 2025. The issue causes systems to falsely report a lack of internet connectivity despite active online status, impacting consumer-facing Microsoft applications such as Teams, OneDrive, and Microsoft 365 Copilot. Microsoft has confirmed the issue and is investigating, while recommending affected users restart their devices to temporarily resolve the connectivity state corruption.
Show sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
Information Snippets
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The KB5079473 cumulative update released during March Patch Tuesday is the root cause of the Microsoft account sign-in failures.
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
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Affected applications include Microsoft Teams, OneDrive, Microsoft Edge, Excel, Word, and Microsoft 365 Copilot.
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
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The issue triggers an error message stating "You'll need the Internet for this. It doesn't look like you're connected to the Internet" despite active connectivity.
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
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Businesses using Entra ID for authentication are not impacted by this issue.
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
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Microsoft has provided a temporary workaround involving a system restart to resolve the connectivity state issue.
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33
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Microsoft released two emergency out-of-band updates for Windows 11 Enterprise devices addressing Bluetooth visibility and security flaws in the Routing and Remote Access Service (RRAS).
First reported: 20.03.2026 09:331 source, 1 articleShow sources
- Microsoft: March Windows updates break Teams, OneDrive sign-ins — www.bleepingcomputer.com — 20.03.2026 09:33