Rocket Chat LiveChat on website showing Insecure; Self Hosted

Good morning fellow WP'ers. I have an issue where I just installed Rocket.Chat on one of our linux boxes. I have the WP plugin for Rocket.Chat configured and setup approprietly. However, if you visit our website (https://cityofhanahan.com) you will see that the Rocket.Chat LiveChat screen doesn't appear (should be in the bottom right of the page browser window) and an error appears in [Chrome] the URL bar that shows content is not secure or unauthorized or something of that nature.

Since I own that server and can modify what I need to, is there anything I can do to allow this to appear or secure the content? I have the plugin installed "SSL Insecure Content Fixer" and it is not fixing this particular problem.

I have also submitted a request to the Rocket.Chat development via their GitHub, https://github.com/RocketChat/Rocket.Chat/issues/5711