I’m having error ERR_NAME_NOT_RESOLVED on non-www version of my website:
I have only 2 CNAME records with name as: ‘www’ and 'domainname.com', pointing to the same heroku dns target.
SSL setting is on full (on flexible I get ERR_TOO_MANY_REDIRECTS error)
I have set a page rule to redirect to www but it seems to not be working (same error after I switch it off)
You could want to either add your root domain to Heroku so it issues a certificate for it, and it works, or add a redirect rule like you mentioned you had at one point.