Multisite blog returning a 404 on the /blog/ "home" page

Hi there,

I installed a multisite website (let’s call it: example.com) with the main website in English (example.com for the home page and example.com/blog/ for the blog), and directories for each languages (example.com/fr/, example.com/de/, etc).

Then in the WP admin panel, I set up a specific page as the home page.

Now that I am building a theme with a tutorial, I managed to have it running nicely but I notice that the URL example.com/blog/ is returning a 404.

It is strange because the “test” blog posts (example.com/blog/post-1/, example.com/blog/post-2/) are returned without any problem but just the “home” page for the blog doesn’t seem to exist or to be found.

What did I missed?

Thank you advance for any advice / suggestion / resource!

ps: I followed the multisite network install exactly so I don’t understand what goes wrong here.