I have a number of domains that do not want to go through any kind of verification.
Maybe it’s because they’re new? Or specific subdomains.
example.info.ke
example.ne.ke
example.me.ke
As an example 1win.info.ke
Your assigned Cloudflare nameservers:
Name Servers
just these two!

whois
Name Server: lewis.ns.cloudflare.com
Name Server: liv.ns.cloudflare.com
DNSSEC: unsigned
I think it’s about these specific subdomains, as I have successfully added domains to cloudflare before from my domain name provider.