Microsoft has fixed a known issue causing the June 2026 security updates to fail on Windows Server 2016 systems that weren't up to date.

The issue was acknowledged in an admin portal service alert confirming IT administrators' reports of 0x80070002 or FILE_NOT_FOUND errors on affected systems.

The bug primarily affected customers attempting to install the KB5094122 update without first installing last month's KB5087537 security update.

Microsoft says the security update installation issue has now been resolved, and affected devices should no longer experience installation failures when deploying the June 2026 KB5094122 security update.

"Microsoft received reports that the June 2026 security update (the Originating KBs listed above) might fail to install on some devices running Windows Server 2016," it noted.

"Affected devices might have received error code 0x80070002 (ERROR_FILE_NOT_FOUND) during installation of the update."

More recently fixed Windows update installation issues

Last month, Microsoft resolved a similar issue causing installation failures and 0x800f0922 errors when deploying the May 2026 Windows 11 security update (KB5089549).

As Microsoft explained when it acknowledged the issue, these failures were triggered by insufficient free space on the EFI System Partition (ESP), causing the update to roll back automatically on affected devices.

In early June, it also warned customers that they may encounter issues installing the latest monthly updates and see 0x80073712 or 0x800f0993 errors on some Windows devices upgraded to Windows 11 24H2 or 25H2.

Last week, Microsoft fixed another known issue that caused Windows Server 2025 devices to boot into BitLocker recovery after installing the April 2026 security update and a bug that triggered installation failures for Windows updates released since May 2025 when installed using the Windows Update Standalone Installer (WUSA).

On Wednesday, Microsoft also confirmed that it's investigating an issue that blocks third-party applications from launching Word, Excel, PowerPoint, Access, and other Office applications (or from opening documents) on Windows systems after installing the June 2026 updates.