Office 2021 Help system not working

1. Restart Office applications 
Close all Office programmes (Word/Excel etc.) 
Re-open to test the F1 Help function 
2. Check that the Help file exists 
Open File Explorer and go to: 
C:\Program Files\Microsoft Office\root\vfs\ ProgramFilesCommonX64\Microsoft Shared\OFFICE16\ 
Confirm the existence of the "OfficeHelp" folder 
3. Repair Office 2021 installation 
Control Panel → Programs and Features 
Locate Microsoft Office 2021 → Click on "Change" 
Select "Quick Fix" → Wait for it to finish. Wait for it to complete and restart your computer 
4. Reset the Office Help settings 
Close all Office programmes 
Delete this registry entry: 
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Help 
(can be found and deleted by running regedit) 
5. Ensure that you can access the Microsoft Help server Microsoft Help Server 
Test that the following link opens: 
https://support.microsoft.com 
If using a proxy/VPN, try turning it off and testing it 
6. Completely reinstall Office 2021 
Uninstall Office via Control Panel 
Rerun the installer