Global products not showing up on main site

I have a main site (
and a store set up under it ( with 1 product in it.

I have my main site set up with chained payments & all the global stuff set the way it should (according to the video tutorial). And yet the product isn't showing up in my main site. I have the mp_list_global_products shortcode set up there.

So, not sure what the problem is. Can you help?