Considering Powerbot doesn't do auth codes, I think you and your friend may be getting that 'license code' for Powerbot (RSBot) confused with a Authorization (Auth) Code for RSBots (notice the 's') aka RSBots.net aka Nexus aka the website that has been shut down for over a year because Jagex took the two Snellman brothers (developers of Nexus) to court and now own everything.
So, if what I'm assuming is true, your auth code is worthless and useless.