
Hi,
As far as I know, OneNote is included alongside the other Office apps, such as Word, Excel, and PowerPoint, when you deploy Microsoft 365 Apps, Office LTSC 2021, or Office 2019. There are no additional steps you need to take to include OneNote with new installations of Office.
Did you install other versions of Office in the same PC before? If yes, I suggest try to run the Office tool and uninstall all Office from PC completely, then re-install Office 2021 LTSC, please download the too from this link:
https://aka.ms/SaRA-officeUninstallFromPC
Then please check status of Office license in PC, if there are other Office license in PC please follow these steps to remove them:
Search CMD, right-click the Command Prompt and run as administrator. Then copy and paste the command, click Enter at last:
cscript.exe "%ProgramFiles%\Microsoft Office\Office16\ospp.vbs" /dstatus
If you are running 32-bit Office on a 64-bit operating system:
cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /dstatus
If you can find the Office product key in list, try to remove it by typing the following command with the Last 5 characters of installed product key (I replace it with XXXXX, but what you type in is what you see on your computer) in this interface:
cscript.exe "%ProgramFiles%\Microsoft Office\Office16\ospp.vbs" /unpkey:XXXXX
If the 32bit version of Office installed on a 64bit operation, run the following command:
cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /unpkey:XXXXX
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