Make sure:

Sign on to your Mac machine and then use your YubiKey hardware token to authenticate.

  1. Sign on to your Mac machine.
    You'll see the YubiKey Authentication window, prompting you to enter a YubiKey passcode.

    Screenshot of the Authentication window showing the passcode field.

  2. Insert the YubiKey into your computer USB port, and then press the YubiKey button

    Make sure the YubiKey Authentication window is selected as the active window before you press the YubiKey button.

    A one-time passcode (OTP) is automatically generated and inserted into the YubiKey Authentication window.
  3. Click Sign On.
    You'll see the green checkmark indicating authentication is successful, and you'll be logged into your machine.

    A screen capture of the Mac login desktop following successful sign on.