Extended Two Factor has additional requirements (on top of XenForo's standard server requirements) for certain aspects of the add-on.
Extended Two Factor is only available for XenForo 2.x. We do not support XenForo 1.x.
Security Key (U2F) 2FA Method
Additional requirements are necessary, due to U2F's requirements. Mainly:
- You must use HTTPS on your website. Your default board URL (in your XenForo Board Options) must be the HTTPS version of your URL.
Any additional URL requirements can be found on the U2F App ID page.
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