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While you can activate Windows through the Settings app, you also can use Command Prompt to make bulk activation easier ...
Learn how to use SLMGR or Software Licensing Management Tool to Install, Uninstall, Activate, View, Extend Windows License.
Try to activate Windows using a new key. Open Command Prompt with admin permission by typing CMD in the Run (Win + R) prompt, followed by pressing the enter key.
Microsoft Windows activation can be tricky when you're using individual software licenses on systems not connected to the internet. See how you can save time to get it done as quickly as possible.