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Why is my YubiKey not lighting up when I use it?

Why is my YubiKey not lighting up when I use it?

    You can test your YubiKey on their demo site, then contact YubiKey if a replacement is needed.

    1. Test your YubiKey here https://demo.yubico.com/.
    2. If it is failing, then you will need to contact YubiKey directly on a replacement – YubiKey troubleshooting.