Apex domains cannot have CNAME records.
Question and response
Question
dig thecoasetheorem.com. NS
Answer
thecoasetheorem.com. 5 NS ns2.thecoasetheorem.com.
thecoasetheorem.com. 5 NS ns1.thecoasetheorem.com.
Authority
The response has no authority records.
Additional
ns1.thecoasetheorem.com. 5 A 217.13.101.212
ns2.thecoasetheorem.com. 5 A 217.13.101.237
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0