Apex domains cannot have CNAME records.
Question and response
Question
dig accountservergroup.com. NS
Answer
accountservergroup.com. 4 NS ns1.accountsupportgroup.com.
accountservergroup.com. 4 NS ns2.accountsupportgroup.com.
Authority
The response has no authority records.
Additional
ns1.accountsupportgroup.com. 4 A 162.215.1.174
ns2.accountsupportgroup.com. 4 A 162.215.1.180
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0