Apex domains cannot have CNAME records.
Question and response
Question
dig thoughtindustries.com. NS
Answer
thoughtindustries.com. 5 NS ns-1308.awsdns-35.org.
thoughtindustries.com. 5 NS ns-908.awsdns-49.net.
thoughtindustries.com. 5 NS ns-149.awsdns-18.com.
thoughtindustries.com. 5 NS ns-1550.awsdns-01.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0