Your Connection to this Site isn't Secure

Good morning

I am seeing the below site is not secure message on our local intranet despite the site using https. There is however an object on the page which connects to a http site which I think is causing the message, i looked through the available policies it looks like the policy 'Allow insecure content on specified sites' should resolve this. I have tried entering both the URL of the HTTP site and the url of our Intranet homepage which is HTTPs but the issue persists. Any ideas?