Apex domains cannot have CNAME records.
Question and response
Question
dig byteplusdns.com. NS
Answer
byteplusdns.com. 5 NS ns2.byteplusdns.com.
byteplusdns.com. 5 NS ns1.byteplusdns.com.
Authority
The response has no authority records.
Additional
ns1.byteplusdns.com. 5 A 3.33.223.77
ns1.byteplusdns.com. 5 A 15.197.209.20
ns2.byteplusdns.com. 5 A 3.33.223.77
ns2.byteplusdns.com. 5 A 15.197.209.20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0