We have added m.nkrealtors.com also during the addition of main domain nkrealtors.com. However, Cloudflare dashboad is not showing sub-domain. We are not sure if sub-domain also reflects on Cloudflare dashbolard.
Also DNS of Cloudflare for sub-domain is not resolving is not accessible on the browser…
Currently, your site is not going through Cloudflare.
When you first add your site, Cloudflare tries to scan all commonly used DNS records, but it does miss some. Though ‘m’ as a subdomain isn’t one it should miss. If it does scan an entry, you can always manually add it to your DNS list on the Dashboard.