Apex domains cannot have CNAME records.
Question and response
Question
dig tgtact.com. NS
Answer
tgtact.com. 4 NS n2.xundns.com.
tgtact.com. 4 NS n1.xundns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0