I’ve run into this before, and it’s usually something simple rather than hardware failure—especially since the rest of your keyboard works fine.

A few things you can quickly check:

Win Lock / Gaming mode – Some keyboards (especially gaming ones) have a “Windows key lock” feature that disables it. Try pressing Fn + Win key or look for a lock icon.

Sticky Keys / Filter Keys settings – Go to Accessibility settings and toggle them off/on to see if it resets anything.

Keyboard driver glitch – Open Device Manager → Keyboards → uninstall the keyboard → restart your system. Windows will reinstall it automatically.

Recent update issue – If this started after a Windows update, it could be a temporary bug. Running sfc /scannow in Command Prompt sometimes fixes system-level issues.

Try external keyboard (if laptop) – Helps confirm if it’s software vs hardware.

Also, test the key using an online keyboard tester—if it doesn’t register there either, it could be a physical issue.

In my case, it turned out to be a keyboard shortcut lock I accidentally triggered. Worth checking that first before digging deeper.