Apex domains cannot have CNAME records.
Question and response
Question
dig captioncolorado.com. NS
Answer
captioncolorado.com. 5 NS ns-1235.awsdns-26.org.
captioncolorado.com. 5 NS ns-586.awsdns-09.net.
captioncolorado.com. 5 NS ns-326.awsdns-40.com.
captioncolorado.com. 5 NS ns-1937.awsdns-50.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0