iPad restricted for kids ISSUE

I set up restrictions on my kids’ iPad minis. Seems to be working great and only allowing access to the websites I allowed. The issue I have is now they can’t access the school’s lesson videos within the website I gave them access to.

Each video is shown within their assignments but when you click on it, it just won’t load. I removed the restriction and it plays fine so any suggestions on what I need to do? I need them to have restricted access to the internet but unrestricted access to the school materials/website. Thank you!