Apex domains cannot have CNAME records.
Question and response
Question
dig kaiyuntiyus-home.com. NS
Answer
kaiyuntiyus-home.com. 5 NS ns2.kaiyuntiyus-home.com.
kaiyuntiyus-home.com. 5 NS ns1.kaiyuntiyus-home.com.
Authority
The response has no authority records.
Additional
ns1.kaiyuntiyus-home.com. 5 A 81.17.98.115
ns2.kaiyuntiyus-home.com. 5 A 5.135.72.188
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0