Apex domains cannot have CNAME records.
Question and response
Question
dig thescubaexchange.com. NS
Answer
thescubaexchange.com. 4 NS ns2.thescubaexchange.com.
thescubaexchange.com. 4 NS ns1.thescubaexchange.com.
Authority
The response has no authority records.
Additional
ns1.thescubaexchange.com. 4 A 185.9.158.44
ns2.thescubaexchange.com. 4 A 51.83.19.238
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0