When I visit the site using Edge, even with Adblockers disabled, I'm unable to view the courses listed as "preview", such as https://courses.dibya.online/courses/fastdeeprl/lectures/383..., and instead get a notice that "this page has been blocked by Microsoft Edge".
This is apparently happening after Teachable updated their video player. Earlier, they used Wistia. Now they use Hotmart.
I have informed Teachable about this issue. They said they will look into it.
The current workaround would be to use Chrome or Firefox (with tracking protection set to a level below "strict").