Video Link in CMS shows no vimeo-video on the real website

Just bought the “copyneat” portfolio template and am trying to embed a video into the CMS template; placing the video link works; preview is also displayed in the cms grid; Unfortunately, the finished page does not display the video (Vimeo). If I place the video link outside of the CMS system, it works - the video is then also displayed. Any hints?

Kind Regards

Here is my public share link: LINK
(how to access public share link)