Get-Hotfix commandlet leverages the Win32_QuickFixEngineering WMI class to list Windows Updates, but only returns updates supplied by Component Based Servicing (CBS). Updates supplied by the Microsoft Windows Installer (MSI) or the Windows update site are not returned by Get-Hotfix/Win32_QuickFixEngineering.
You could try the solution in this link:
Windows: How to List All of the Windows and Software Updates Applied to a Computer
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