Support » Plugin: Two-Factor » Issue with WordPress 5.1.1?

  • Resolved Joe


    Hello, when trying to login using FIDO U2F with a Yubikey, I get a javascript error callback about 5 seconds after touching my Yubikey.

    As far as I can tell, this began with the most recent WordPress update.

    The error is:

    “Registration Failed 5” from fido-u2f-login.js

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Author Kaspars


    We’ve tested the plugin with WP 5.1 and it works great. I’m also using it on my personal site.

    – Does the error happen when registering a new U2F device?
    – Do the previously registered U2F devices still work to login?
    – Are you registering a U2F device that is currently not already registered for the user account?



    It happens both while trying to log in with an existing key and registering a new key.

    For now I’ve disabled log in using the key, but it’s very odd!

    I’d like to troubleshoot for you but I’m not sure where to start.

    The problem resolved itself after deleting all plugin data and starting over.

    Sorry for wasting any of your time!

    Plugin Author Kaspars


    Thanks for the update @joecole1! Marking this as resolved.

Viewing 4 replies - 1 through 4 (of 4 total)
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