What is the name of the domain?
datos.addme
What is the error message?
domain not valid
What is the issue you’re encountering
domain not valid
What steps have you taken to resolve the issue?
not resolved
Kindly, could you please cross-check and share your actual domain name in bracketed dot [.] notation (example[dot]com) in your next reply here so we could double-check, troubleshoot and provide some more feedback information about the issue? 
May I ask if you’ve verified your Cloudflare account?
May I also ask if you’ve added your Billing and Payment information to your Cloudflare account?
i have like 20+ domains in my cloudflare accout, just bought a new one in namecheap.com, when i tried to add this returned domain not valid. the domain is datos.addme where datos[.]addme is the extension. i’ve talked with namecheap, they said domain is already registered and running just wait to propagation so i have to wait, i added to an alternative nameserver meanwhile,but i always use cloudflare
Looks like it’s a Handshake domain
Which is why I cannot WHOIS anything for it:
The concern from my side is about SSL as stated here:
Namecheap hosting is compatible with HNS domains, however, please note that it’s not possible to generate SSL certificates for HNS domains and HTTPS:// protocol is not available for these TLDs. Also, you still will not be able to resolve them via regular browsers.
Source article:
You’d have to use a different resolver for such domain.
The request for handshake TLD support is here and unfortunately Cloudflare doesn’t support Handshake domains yet:
Only proper ICANN-accredited top-level domains work with Cloudflare from the Public Suffix List (View the Public Suffix List).
More topics about the HNS domains using search 
:
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