I appreciated if anyone help me fix this issue.
The website is currently hosted on a server and uses CF DNS but when I tried to map a new subdomain through CF DNS the ip address changed according to https://support.cloudflare.com/hc/en-us/articles/203322654-Why-is-my-domain-resolving-to-the-wrong-IP-when-I-do-a-DNS-lookup-or-ping-
My issue now is that the new subdomain doesnt work!
The IP address should change to Cloudflare’s proxy server IP addresses.
What’s the subdomain?
I see the 521 error, most likely because it’s not going to the proper IP address.
Is the subdomain on the same web host plan as the main domain?
If you set that subdomain to in Cloudflare DNS, does it work?
Yes, it works without CF proxied cloud
Perhaps something at the server is blocking Cloudflare:
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