Connecting to cname issue.

admin

I am like this, my domain is registered in cf, I want to use the own preferred ip of cf, but it can't be done, so I moved the domain to other places recently. Just a few days after moving out. Now I use cname to connect to cf, and directly resolve the A record of the original domain to the preferred IP that was selected, always fails. The same situation occurs on another platform registered by another platform, which can access normally through the same operation process. I don't know what reason there is, if you have encountered similar situations before, how do you solve this problem now? I can only directly resolve the IP of the vps server.