Apex domains cannot have CNAME records.
Question and response
Question
dig ysi.yamani-spring.com. NS
Answer
ysi.yamani-spring.com. 5 NS ns1.ysi.yamani-spring.com.
ysi.yamani-spring.com. 5 NS ns2.ysi.yamani-spring.com.
Authority
The response has no authority records.
Additional
ns1.ysi.yamani-spring.com. 5 A 202.150.148.238
ns2.ysi.yamani-spring.com. 5 A 202.150.148.238
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0