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After major updates, Windows may re-check your hardware and licensing status.
If mismatch occurs, activation can be lost.
If your license is linked, signing in can restore activation.
Settings → Activation → Troubleshoot
Manually re-enter your license key.
If activation cannot be restored, your key may not be valid anymore.
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Q: Why did activation disappear after update?
Because hardware or system signature changed.
Q: Do I need reinstall Windows?
No.
Windows activation loss after update is common and usually fixable. The most stable solution is reactivation or using a valid license key.
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