Membership script on domain website not handshaking with subdomain script

[dblack]

What is the name of the domain?

HashSets.com

What is the error number?

404 error

What is the error message?

404 error: Page not found

What is the issue you’re encountering

Subscription membership script (php) on domain is not handshaking with script on subdomain. Membership script handshake works fine without Cloudflare on both domain and subdomain.

What steps have you taken to resolve the issue?

1. Added CNAME record for subdomain “europe.hashsets.com” to Cloudflare DNS management with “Proxy”.
2. Immediately tested the domain website (hashsets.com) subscription membership script after implementing Cloudflare but the domain website script and subdomain script do not handshake. Instead, domain website says there is a 404 page error (see attached screenshot). Apache log for the subdomain website does not show any connection attempts from the domain website.
3. Am I doing something wrong as far as DNS setting or do I need to add some type of new rule? I have everything as default settings with Cloudflare and have NOT implemented any WAF or rules as of yet.

What feature, service or problem is this related to?

DNS records

Screenshot of the error

[dblack]

I found the solution. For the subdomain I removed the CNAME Record and added an A Record instead and the handshake between both websites (domain and subdomain) work!