SSL will not install

I have multisite installed. is primary domain. is a subsite. I have marketpress installed and activated on this subsite. I have SSL cert installed. I have verified SSL is properly installed. Edge is currently the only browser I see rendering the "secure" icon. All other browsers still say the site is not secure.

I have verified the browser is rendering https and is not redirecting to http.

I have set shopping cart to "force https". No effect.
I have changed the domain mapping to https. No effect.
I have visited "sites" from superadmin dashboard and changed the domain of the site to https. No effect.

the site continues to render each and every page via https, and every page confirms it is no encrypted and unsafe for ecommerce transactions. Any insight is much appreciated, I don't know what other settings I can change.