The Software Licensing Service reported that the license could not be found or was invalid. The error code usually means that the user entered the wrong license key ...

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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 KB4598291 ...

Windows 10 product usually works with Windows 11, but the problems occur if your Windows 10 license is an OEM license (tied to original device hardware and not transferable) rather than a Retail ...