Help with pointing a subdomain to cloudflare

I currently have a domain used on a server, I publish a simple web page. I have an ERP in aws, so that users will not connect with the ip provided by the cloud, point a subdomain, with a reverse proxy the ip is resolved. What happen? I want to put a little security with cloudflare, but only for this subdomain without affecting the page, when trying to implement it asks me to add the complete domain, can someone help me?

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