Problem: Cloudflare - certificate has not enough info to verify https://claimflights.eu/ and the https is not working. I have installed cert correct and moved to the CF DNS.
With absolute the same procedure and installation the domain https://claimflights.it/ works perfect only the eu version is not working.
Thats not a certificate issue but a redirection issue and it is well-known
You probably set an insecure SSL mode on Cloudflare (Flexible) which is why Cloudflare connects via HTTP. Switch that to Full Strict instead. Just make sure your server is properly configured for HTTPS and has a certificate.