An easy way to test if your new subdomain is proxying your traffic is to set up a firewall rule and check to see if the firewall is working. You can create a new Cloudflare firewall rule that blocks your new subdomain. For the Hostname, use the exact address for the new subdomain and block all visits. Save this firewall rule and use an internet browser to visit your subdomain. If it’s working correctly, you’ll get an error message when trying to visit the subdomain. After testing, be sure to remove the new firewall rule. If you don’t, all visits to your new subdomain will be blocked.