I probably did something wrong but this is what I currently see when I try to go to mikemonty . com after going through the dns steps 
Attach custom domains to your nostr-sites!
We're releasing the custom domains feature for public testing. Go to site settings and check the Custom domain section.
Please send your feedback so we could improve the process. Eventually this will be a paid feature, but everyone who uses it now will keep it for free.
And a reminder that you can also self-host: https://blog.npub.pro/post/how-to-self-host-on-github
Discussion
how did you get it working? I am having the same problem