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Yubikey provides their own own 6-digit-code 2FA app, which requires Yubikey to unlock, so they will advertise that any website that works with standard 6 digit code apps as supporting yubikey. Even the sites that do work with Yubikey will often only work with Google Chrome, despite Firefox supporting it and there being plugins to add support for Safari. I am returning my Yubikey but might buy one in the future if it gets better supported. I am disappointed in Yubico's dishonest marketing of their product.