Currently hosting a PHP site on Heroku with a custom domain site that I bought through Hostgator. I've followed this https://stackoverflow.com/a/47930979/4470851 to get PointDNS set up for my custom domain, and this guide https://devcenter.heroku.com/articles/custom-domains to get the DNS Targets- I've set the given DNS targets as the CNAME alias through Hostgator, and now the custom domain is working, but I'm getting the insecure site warning through Chrome. I upgraded my Heroku Dyno to be a Hobby plan (per https://devcenter.heroku.com/articles/automated-certificate-management) so Heroku should be handling my SSL now. I'm getting the Firefox warning: "The certificate is only valid for the following names: *.herokuapp.com, herokuapp.com ".
This is not for a subdomain.