Host not Found! - Minecraft, Cloudflare, External Domains

Playit.gg Configured:

Details:

I installed Cube Coder’s AMP and spun up an instance of Minecraft Java. It is accessible via its local ip and port, but when I try to use my external domain, I get a host unknown error. Any help is appreciated!

Note: I would’ve attached more info, but as a new user, I can only attach one thing at a time.