Windows 10: Win 10 pro reactive on new computer

I try to deactive win 10 pro digital license and use it on my new computer but when i go to regedit to see my product key the key display is a default generic key for win 10 which is VK7JG-NPHTM-C97JM-9MPGT-3V66T here is the slmgr cmd if u guys wonder if the win locense legit or not this retail license came with my old prebuild pc so i dont know how to find my product key because when i try to use wmic cmd is just left a blank page

:)

 

Move windows 10 from old computer to new.

Just install Windows 10 Pro on the new computer and use your Windows 7 Ultimate key to reactivate.

Step 1: How
to download official Windows 10 ISO files

Step 2:

• How to: Perform a clean install of Windows 10

Reactivate:

Activate Your Windows 10 License via Microsoft Chat Support

Resources;

• How to Transfer your Windows 10 License to a New Computer

 

Reactivation win 10 pro doubt

Can I reactivate a oem license win 10 pro key by linking it to MS account incase i change my motherboard??

 

Motherboard change unable to reactivate Windows 10 Pro -

I have searched this topic and everything seems to be almost a year old. This is a homebuilt machine circa 2015. It started with an ASUS FM2+ motherboard with an AMD A5600K processor. It was Windows 7 Pro, upgraded to Windows 8.1 Pro then to Windows 10 Pro.
Saturday the motherboard died. An exact replacement could not be located so a Gigabyte card was installed. No changes to the hard drives. Booted the machine and Windows automatically started and then did a "revert" then installed the latest updates. C Drive was in the red so I deleted all of the old install files using Windows Clean-up. Went to reactivate, checked the significant hardware change and entered my MS account information - The computer (none of my computers) were listed and now it is telling me that I have to spend $200 to buy a copy of Windows 10 Pro.
Have not yet called Customer Support as the computer is at home and I work during the day -
I do have a disk image or two that may be a year old -

Suggestions - should I just shell out the $200 and move on

TIA