How to Fix Windows 10 / Server 2016 Activation Error 0xC004C003. Unable to enter windows product key

Change Product Key button does nothing!

We can’t activate windows on this device because you don’t have a valid digital license or
product key. If you think you do have a valid license or key, select Troubleshoot below. Error code:0xc004c003
0xC004C003 -The activation server determined the specified product key is blocked. Change product key and troubleshoot option also blocked.

The main reason for this error 0xC004C003 is that you entered an incorrect product key that can’t be used to activate Windows.

“can’t activate windows and can’t click on Change Product Key link”

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