When you want to host your base domain (https://mydomain.com, instead of a subdomain like https://stories.mydomain.com), please note the following. 

Shorthand DNS

Where your root domain is only used for Shorthand stories email and other services will not work.

For Shorthand DNS, please set up your hosting in your organisation settings. You will need to log in to your domain name registrar and update your domain name to point to these new name servers.