Apex domains cannot have CNAME records.
Question and response
Question
dig techbuildgo.com. NS
Answer
techbuildgo.com. 5 NS ns-1015.awsdns-62.net.
techbuildgo.com. 5 NS ns-291.awsdns-36.com.
techbuildgo.com. 5 NS ns-480.awsdns-60.com.
techbuildgo.com. 5 NS ns-715.awsdns-25.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0