Is the domain .project supported?

I’m trying to add this domain “undef.project” as a website in dashboard but i get the error:
We were unable to identify undefined.project as a registered domain. Please ensure you are providing the root domain and not any subdomains (e.g.,, not

Is it because the domain name? is .project supported?

.project is a handshake domain. Those are not supported by Cloudflare. Only domains with a suffix on the public suffix list can be added to Cloudflare.


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