embedded video on website

Do you mean the http isn’t replaced with https by the mixed content fixer?

What is the issue exactly?

Yes correct you can access the page (the page itself is replaced by https) but the content is not replaced with https. Instead you get icon of a broken content

The mixed content fixer replaces all src=”https:// strings with src=”https://, so did you check if the mixed content fixer is active?
https://really-simple-ssl.com/knowledge-base/how-to-check-if-the-mixed-content-fixer-is-active/

I just checked and the plugin does change the src to https.
The src is a streamed video from a remote location (outside the website).
Perhaps it is because the remote location is http and not https? If that is the case how can I rectify this issue?

If you cannot move the video to a https domain, you could either deactivate the mixed content fixer, or remove the src=”http from the url list with add_filter(‘rlrsssl_replace_url_args’). Both last two solutions will cause mixed content warnings on your site though.