"News Page of my Blog posts" might not be working

MultiSite + BuddyPress (but no BP Groups yet).

The "Main" site has a blog page (i.e. the blog posts aren't the home page): example.com/blog

Visiting that URL doesn't display anything other than the header and footer sections even though there is 1 blog entry.

Setting "blog" page's template to 'Blog news' doesn't change anything.

Is it not working or am I not understanding what it's supposed to do?