So what exactly is happening? When you try to activate the operating you get the following error: This issue is not present on devices that are running the January security release or an earlier release,” Microsoft explains. Please note the January 2021 nonsecurity preview release, also known as the “C” release, was released Februand is separate from the January security release, also known as the “B” release, which was released January 12, 2021. “Windows 10, version 2004 and 20H2 devices that have the January 2021 nonsecurity preview release, or a later version, installed might experience Windows activation failures containing error code 0xC004C003. The company explains that both Windows 10 version 2004 and version 20H2 are impacted by the glitch, adding in a support document that devices where the problem occurred could no longer run the Windows activation, as the process fails with error code 0xC004C003. Microsoft has finally released a workaround for a bug introduced by the January 2021 non-security cumulative update preview and later.