Why isn't a subdomain working?

The general cause of a subdomain on Cloudflare not working on a site is that you haven't added it in your zone file for the domain.

You can add a subdomain by following this guide: How do I add a subdomain

It should either be an A Record (in which case you need the IP address it needs to point to) or a CNAME (in which case you'll need another subdomain for it to point to).

Example using a blog subdomain:

A blog points to server IP address (insert server IP address in field)

CNAME blog is an alias of (insert your domain.com)

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