Mopidy not scrobbling to (from music box)

I am trying to get tracks scrobbled to my account.

I enabled in my music box settings (and put the right username / password) and rebooted. Nothing happens at all, I get nothing on my page and no indication that something is not working.

Unlike this discussion the song doesn’t show up at all (not even while it is playing).

I am running musicbox 0.6.0 and playing local files. I tried looking in /var/log/modify but found nothing interesting there. How should I go about troubleshooting this ?

Thanks !