Windows 10: Activating Windows 10 with Bootcamp and Valid Product key

I'm trying to activate windows 10 on bootcamp with a valid windows key, and every time I try it fails. I've used this key for a long time now and Microsoft will mot validate my machine...No matter which way I go, I can't activate. Even though I know the keys are all valid.Anyone else having issues validating the product install?

:)

 

Activation Error 0xC004C003 - MacBook BootCamp reinstallation

Bought a Win10 pro digital licence for my MacBook and installed with BootCamp. I accidentaly deleted my bootcamp partition. While reinstalling the windows through bootcamp and trying to activate it says : "We can't activate Windows on this device because
you don't have a valid digital license or product key. If you thinnk you do have a valid license or key, select troubleshoot below. Error code 0xC004C003"

Need Help

 

Windows is not activated with valid product key

I bought this license and activated this Windows like 1 or 2 years ago, and it's a valid key, I had my Windows Activated and everything works perfectly until today when I saw a watermark at to bottom corner asking me to Activate Windows.

I tried to reenter my product key but it says that I do not have a valid product key and refuse to activate my windows

Is there any solution for this?

P.S. I didn't reinstall my Windows or make any hardware change

 

Windows 10 product keys and activation - and the KMS angle

Changing the product key to the generic Windows 10 product key will reset activation to the standard retail channel for activation. It might just activate (if there was a previous digital license for Windows 10 for that computer established with Microsoft). Once Windows 10 is back on the retail activation channel, then more than likely changing the product key to the Windows 8 product key using the same method may work.