Currently, Touch ID can only be used when logging into web-based applications that show the Duo Prompt when using Google Chrome on macOS. Duo and Touch ID will not work on Safari or other browsers.
Make sure Google Chrome is your default browser on your Mac. If you have removed it, re-install it.
Due to the limitations of Touch ID, it is highly recommended that you add another 2FA device as your primary method.
See list of other 2FA methods here - https://infosec.yorku.ca/2fa-auth-methods/
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