Apex domains cannot have CNAME records.
Question and response
Question
dig bluecoatcloud.com. NS
Answer
bluecoatcloud.com. 2 NS ns4-66.akam.net.
bluecoatcloud.com. 2 NS ns1-253.akam.net.
bluecoatcloud.com. 2 NS ns7-65.akam.net.
bluecoatcloud.com. 2 NS ns5-64.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0