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In brief: Microsoft has suffered through a steady stream of bugs in recent memory and the latest appears to be primarily targeting Windows 10 Pro users that upgraded from Windows 7 Ultimate or Windows 8.1 Pro via the free upgrade offer a few years back. Perhaps it downgraded your Windows 10 Pro installation to Windows 10 Home, or maybe it introduced display audio issues, installed bad audio drivers, failed to handle zip files correctly, or display all unicode characters, or maybe you had problems with Edge and Store apps? No?
Microsoft support owes these users an apology as the activations were legitimate, it was Microsoft's servers that were wrong. This issue seems to affect those running even earlier Windows 10 versions as well. But Microsoft quickly fixed the issue. The message also gives users the option of purchasing a new key to reactivate their copy of Windows 10 Pro, despite users having a genuine Pro key.More news: BTS performance in Japan canceled over atomic bomb shirt
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Microsoft has just released an Emerging issue announcement about current activation issue related to Pro edition recently.
Jeff Jones, Sr. Director, Microsoft says: "A limited number of customers experienced an activation issue that our engineers have now addressed".
The cause for this is being attributed to the failure of Microsoft's Activation Servers to validate the Windows 10 licenses. If needed, you can try your luck with Microsoft Support to see if they can issue a replacement Pro key but it shouldn't take long before Microsoft corrects the error.
As a refresher, 19H1 is the next Windows 10 feature update scheduled for launch in April next year.