I disabled dynamic update of setup.exe in OS Upgrade step.
In-Place Upgrade Task Sequence from 1909 to 20H2 completes fine but it is still 1909

SCCM 2006 with all hotfixes
Windows 10 x64 1909
We created simple IPU with 20H2 OS package. The TS completes successfully but when I look at the system info of actual computer itself, it is still 1909. TS Status Message viewer shows no errors.
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Pavel yannara Mirochnitchenko 12,781 Reputation points MVP
2021-04-07T17:10:56.577+00:00
2 additional answers
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Rahul Jindal [MVP] 10,691 Reputation points MVP
2021-03-31T21:57:00.76+00:00 Probably exiting right after running compatscan. Check the compat xmls under panther directory.
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HanyunZhu-MSFT 1,846 Reputation points Microsoft Vendor
2021-04-01T08:32:08.017+00:00 @Pavel yannara Mirochnitchenko
Thanks for posting in Microsoft Q&A forum.
At first, maybe it's just a display problem, you can check the OS version by using methods other than using systeminfo command.
It is suggested to check the OS version by running the PowerShell commands : (Get-WMIObject win32_operatingsystem).Buildnumber
For more methods, please refer to this article: https://www.winhelponline.com/blog/find-windows-10-build-version-edition-bit/
Note: This is not from MS, just for your reference.Secondly, could you please share your smsts.log (with sensitive information masked), so that we can confirm that whether the steps of upgrade in task sequence have been run.
What's more, you can copy the iso file to another computer, open the iso file and double-click setup.exe to manually install the OS, in order to confirm there is no problem with the package.
For more details, please refer to this link: https://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install/how-to-upgrade-to-windows-10-version-20h2-using/617a37da-8fc0-4f33-a3eb-59fe9082f925Thanks for your time.
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