You pointed proto to ns<1-4>.byet.org. Cloudflare’s serving that delegation fine but ns<1-4>.byet.org are refusing queries for your domain.
; EDNS: version: 0, flags:; udp: 1232
; EDE: 22 (No Reachable Authority): (at delegation proto.kmteam.tech.)
; EDE: 23 (Network Error): (198.251.86.154:53 rcode=REFUSED for proto.kmteam.tech A)
dig proto.kmteam.tech @ns2.byet.org
; <<>> DiG 9.18.24-1-Debian <<>> proto.kmteam.tech @ns2.byet.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 21516
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available
This usually means they haven’t been configured to accept queries for that dns zone (proto.kmteam.tech). You’ll have to reach out to the operators of ns1-4.byet.org for more info.
First, please check your NS records are correctly configured in your DNS setting and make sure your NS records are correctly pointing to authorative nameservers for your subdomain. You might be seeing this a small task and thinking that how can I forget such a small task but some time small errors make a lot of problems. This has happened with me and I created a mess at that time. so please check that if that is not the problem you can ask me to get more checks.