Apex domains cannot have CNAME records.
Question and response
Question
dig c2tiapps6.com. NS
Answer
c2tiapps6.com. 5 NS ns2.c2tiapps6.com.
c2tiapps6.com. 5 NS ns1.c2tiapps6.com.
Authority
The response has no authority records.
Additional
ns1.c2tiapps6.com. 5 A 162.214.65.168
ns1.c2tiapps6.com. 5 A 162.214.100.48
ns2.c2tiapps6.com. 5 A 162.214.65.170
ns2.c2tiapps6.com. 5 A 162.214.73.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0