Apex domains cannot have CNAME records.
Question and response
Question
dig vs77100.com. NS
Answer
vs77100.com. 5 NS ns3.onlydomains.com.
vs77100.com. 5 NS ns2.onlydomains.com.
vs77100.com. 5 NS ns1.onlydomains.com.
Authority
The response has no authority records.
Additional
ns1.onlydomains.com. 5 A 75.2.6.34
ns2.onlydomains.com. 5 A 75.2.85.37
ns3.onlydomains.com. 5 A 130.180.201.164
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0