Web services sometimes require custom domains, and so do apps hosted with Netlify. Domains are not necessarily hosted with the same platform to host apps, so in this article, I note the name server problem to keep apps from being connected with your domains.
i. e. I can only access sites through domains with subdomains (
To ensure that what name servers are set, you can run
whois <your domain> | grep -i "name server".
As this article explains steps when using external DNS, you should set Netlify name servers on the domain detail page