Screen grab not working on windows 10

can anyone tell me how to get the screen grab feature to work on windows 10? In the Options > Hotkeys, there’s a setting to ‘Screen Grab an Area’ with the default hotkey set to Windows + W. Windows 10 uses that hotkey to launch the Windows Ink Workspace, which can be disabled through a registry edit, but I just decided to use Windows + Z instead, but it still doesn’t work. Any suggestions?

Nope, I use a third-party product.

Maybe Windows-Z is also taken by something else.

Somewhere in the Microsoft UI design guidelines, it says that Windows key combinations are all reserved for MS to use, so I can't complain really when they don't work.  I've moved screen grab for myself to alt-w, which works fine, doesn't conflict with any other combinations I use, and which doesn't contravene UI guidelines.

Tom