auth failed us usually because your key isnt correct.
make sure the one your using is the one listed when you log into your buddyauth account.
Max Sessions, means you logged in correctly. but your session is already in use somewhere else.
this can happen if you quickly close and re-open and try and login, or if you have another bot running ether in the background or on another machine.
to fix this you can log into your buddyauth account, and once you get in you can kill any active sessions you may have. after that if your key is correct you should be able to login.