I've been using Bulletproof and Duo Security simultaneously (along with Wordfence) for months.
However, recently I updated some plugins and now Bulletproof will not allow me to use Duo Security to log in. I log into WordPress, but on the second authentication step I am kicked out and told that my login credentials are invalid.
I've disabled numerous plugins and isolated Bulletproof as the culprit. With it deactivated, I can log in and use Duo SEcurity just fine.
Any suggestions? I really like BP.
My site is scorpioland.org btw.