Apex domains cannot have CNAME records.
Question and response
Question
dig cls-ha.pub. NS
Answer
cls-ha.pub. 4 NS rocky.ns.cloudflare.com.
cls-ha.pub. 4 NS betty.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
betty.ns.cloudflare.com. 4 A 108.162.192.75
betty.ns.cloudflare.com. 4 A 172.64.32.75
betty.ns.cloudflare.com. 4 A 173.245.58.75
rocky.ns.cloudflare.com. 4 A 108.162.193.227
rocky.ns.cloudflare.com. 4 A 172.64.33.227
rocky.ns.cloudflare.com. 4 A 173.245.59.227
betty.ns.cloudflare.com. 4 AAAA 2606:4700:50:0:0:0:adf5:3a4b
betty.ns.cloudflare.com. 4 AAAA 2803:f800:50:0:0:0:6ca2:c04b
betty.ns.cloudflare.com. 4 AAAA 2a06:98c1:50:0:0:0:ac40:204b
rocky.ns.cloudflare.com. 4 AAAA 2606:4700:58:0:0:0:adf5:3be3
rocky.ns.cloudflare.com. 4 AAAA 2803:f800:50:0:0:0:6ca2:c1e3
rocky.ns.cloudflare.com. 4 AAAA 2a06:98c1:50:0:0:0:ac40:21e3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0