I have a strange problem with production server and Sensei LMS Vimeo embeded video. When I try to embed video through Vimeo block it works (partially, on second time when I load the page). But when I go to the lesson, there is no video, just the link I put into the block to embed the video.
I found its the tag that is not saved to or ignored or something. I tried it on my local dev environment and its okay. But on production server (which I have full control of) its just ignored. Its not a problem of any plugin, neither theme, nor wordpress itself because I made the exact same copy of the website to my local dev environment and it works.
So this is response after I save the post (lesson) Also what it produces is problem that iframe is not display in the actual post.
Second thing I noticed is on production server when I am editing the post the embeded Vimeo never loads on first time and I get a proxy error (screen below)
But when I hit "Try again" it loads
Any ideas about security of PHP / Apache maybe ?
UPDATE1: I tried youtube and it works like charm, so maybe I am blocked somehow within the proxy - NO PROXY
UPDATE2: I found when I try to load the video using vimeo block, first attempt fails but retry works, because the url is different