I am in the process of creating a portal for my son to play with (gametips4gamers.com). Part of the setup I am trying to setup SSL. The server is a Ubuntu 16.x server setting up a WordPress site.
The process to setup the encryption was completed successfully, however, my browser is not showing the site as secure. The site would flash secure for a moment, then will show not secure.
I tried to make the changes in the code, but it did not help. I then took a closer look at the admin portal and found the settings to make the changes you suggested.