Two-Factor via U2F Keys?

Hi all,

For this forum, can we add the feature to use U2F keys (Yubikey being their biggest vendor) for authentication in addition to OTP?

I'm guessing that would be something to take up with the folks at XenForo, who maintain the BBS software this forum uses.
XenForo will not be adding more 2FA providers to its product. There is a commercial add-on for $10. We have funding in place for XF, not for commercial add-ons. If this is a widely-requested add-on we might look for funding, but if it's just a one-off, it's not worth going thorugh the process for.