Does it work as you expected when a default WordPress theme is activated on your site?
We’ve checked, and found out that the oEmbed doesn’t work, as described in the article you provided, even when a default WP theme is activated. Check screenshots in the private content area. It means the situation is independent of our theme.
You can contact the support of WordPress.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.