I thought I'd just add to this thread for anyone asking, when I was logging in using my username, I got told I had to use the Jagex launcher. The minute I used my email address instead, OSBot worked and logged in. Thought this may be helpful for anyone that was googling like myself.
Hopefully a fix for this soon - would love to us this but Jagex launcher is now stopping it. Progress is slow when having to work and can't auto kill chickens on a fresh account... Any help appreciated