Windows 11 install not Recognising Windows 10 Pro Product key

Hi all,

I have a HP Prodesk G4 and have performed a fresh windows 11 install. The install is not picking up the Windows 10 Pro OEM Product Key from the BIOS that these devices came installed with.

When I go into the Activation settings, it states it is a Digital Licence instead of an OEM licence.

When I run ShowKeyPlus it is listing the OEM edition as Windows 8 as shown below (have blanked out most of the product key). This device came installed with Windows 10 Pro and even confirmed this by checking with the Serial number on HP support website.

I suspect the windows 11 install is not picking up the OEM product key as it doesn't think it is Windows 10 (but maybe wrong)

Any help will be appreciated as I really haven't budgeted to purchase a new Licence.

Cheers

Jeff