To fix Windows Update error 0x80070643 when attempting to install 2024-01 Security Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5034439), see:
KB5034439: Windows Recovery Environment update for Windows Server 2022: January 9, 2024
https://support.microsoft.com/en-gb/topic/kb5034439-windows-recovery-environment-update-for-windows-server-2022-january-9-2024-6f9d26e6-784c-4503-a3c6-0beedda443ca.
Make a note of the 0x80070643 - ERROR_INSTALL_FAILURE section.
In that article, follow the link to:
Add an update package to Windows RE > Extend the Windows RE Partition
https://learn.microsoft.com/en-gb/windows-hardware/manufacture/desktop/add-update-to-winre?view=windows-11#extend-the-windows-re-partition
Perform the Powershell script presented on this page to extend the Windows RE Partition.
After extending the partition, reboot the Windows Server, then attempt to perform the update. Windows Update should then install KB5034439 correctly. If you encounter error 0x80248007, retry the update again.
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