Reverse proxy on service.qnapid.myqnapcloud.com

Hello
I would like to set up a reverse proxy using the myqnapcloud domain.
The DNS resolution works fine on qnapid.myqnapcloud.com, it points to my IP.

But it does not work on any sub domain, like service.qnapid.myqnapcloud.com

How to enable this DNS resolution?

I hope you are not exposing your NAS to WAN, even QNAP discourages this strongly now and only advertises QNAPCloudLink (tunnel).

Hiding services via reverse proxy is only limiting some attack surfaces (code vulnerabilities would still exist)