There should be no issues particular to IDN domains. It looks like you got this added correctly. The nameservers are responding, and I can see Cloudflare have issued a cert for your domain. crt.sh | xn--1rwx6b.xn--j6w193g
You have no DNS records for the naked domain or www so you need to start adding some records to get things to work.
yes, I added successfully when i changed Cloudflare website to Chinese interface.
If I use English interface, the problem persists. I already reported to [email protected]
Michael, thank you for your information
Yoav, that is a completed Chinese url, no .cn or .hk at the end.