Sync not working

I've set everything up, and it says it is connected on the sub-site, but when I add a new user to the master site, it doesn't show up on the sub-site.

I've tried registering a user both on the front and backend, and neither shows up.

EDIT:
I'm not sure if this has anything to do with it, but when I look at the saved settings, there is a space following the 'Key of Master site'. This isn't there when I save the information, but appears on both sub-sites I have.