If you're looking for a quick way to fix the Cloudflare "Example.com is not a registered domain", this article's for you. First, why does this error happen?
There are three main reasons why Cloudflare isn't accepting your domain:
The domain has no current nameservers
The domain simply isn't registered
domain name servers don’t contain any DNS records
How do you fix the …is not a registered domain error?
Actually resister the domain
Add dns records
Wait a bit if you just registered it
Turn on your parking page from the registrar (this is the best method).
For us, all we needed to do was turn on our registrars parking page, and everything worked like a charm.
In rare cases, the TLD may be brand new, and not on the Public Suffix List (link to the list). The PSL is a list of all (you guessed it) public suffixes. It allows browsers to:
Avoid privacy-damaging "supercookies" being set for high-level domain name suffixes
Highlight the most important part of a domain name in the user interface
Accurately sort history entries by site
Other companies, like Cloudflare, use it to categorize domain names for their system.
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