I know it defeats the purpose but without any insight on a recent update in the mirroring capabilities, utilizing an HDMI plugin may be my best bet right now. Firstly, does anyone know if this would work? If so, do you have recommendations?
Right. I should have said it's not officially supported at the moment. The trick in the video above might work for you. Also, you can Facebook Live stream to a private post on your Facebook wall and then open Facebook on your computer (I think there is about 1 second delay, but may be good enough).