Fix Error 0xC004C003, 0xC004C003, The activation server determined the specified product key is blocked, on Windows 11/10, by following this guide.

Microsoft has shared a workaround for customers experiencing 0xc004c003 activation failures on Windows 10, version 2004 and 20H2 devices after installing the January 2021 monthly "C" release ...

Windows 11/10 Activation Error 0xc004e016 usually occurs because of a wrong product key, however, there could be some other reasons too.

The very first thing that you need to do when trying to fix activation error code 0xc004f063 is to run the automated Windows Activation Troubleshooter.