Created site, pasted code, no results


I recently created a new site in my Piwik installation and pasted the code into the header of my Joomla site:

This was a couple of days ago. It doesn’t seem to be working. I’m still reading zero across the board. I have another Joomla site, on which it seems to work.

I’m confused as to what I may have missed, and would appreciate any suggestions.