Hi,
Windows activation keys—especially retail or OEM licenses—are often tied to the original hardware. Even if the previous device is no longer in use, the activation system may flag the key as already assigned. We recommend running the Activation Troubleshooter via Settings > System > Activation > Troubleshoot to attempt automated resolution. If the issue persists, you may need to contact Microsoft Product Activation Support directly to validate your Install ID and request a manual reactivation.
For privacy and security reasons, please avoid sharing product keys publicly. If needed, we can guide you through secure channels for verification.
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Best regards,
Quinnie Quoc.