This content was taken from a Microsoft document.
https://support.microsoft.com/ko-kr/topic/09e85404-1cb6-4ed4-9ca5-3e40d74307b9
[Microsoft account login] Modified: After Windows updates released on or after March 10, 2026 are installed, some users may experience problems logging into apps with their Microsoft accounts. Even if the device has a working internet connection, an "No Internet" error may appear during login and block access to Microsoft services and apps (e.g., free Microsoft Teams and OneDrive).
Note: Only logins using a Microsoft account are affected. Businesses that use Microsoft Entra ID for app authentication are not affected by this issue.
This update is provided through a Windows Update for devices running Windows 11 that have already installed KB5079473. It can also be downloaded manually from the Microsoft Update Catalog.
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https://x.com/WindowsLatest/status/2035726616983478505
