Moped SoundCloud authentication error

I’ve installed keep getting an authentication error when I try to connect mopidy to Soundcloud on an iMac El Capitan after installing Mopidy with Homebrew.

I’m confused, is this anything to do with pimusicbox?

Yes, I’m trying to authenticate the PiMusicBox Soundcloud account
through the web interface in Safari on an iMac. It opens the
authentication window but then throws the error message and doesn’t give
me the token.