Apex domains cannot have CNAME records.
Question and response
Question
dig eprism-cloud.com. NS
Answer
eprism-cloud.com. 4 NS ns-1894.awsdns-44.co.uk.
eprism-cloud.com. 4 NS ns-1427.awsdns-50.org.
eprism-cloud.com. 4 NS ns-449.awsdns-56.com.
eprism-cloud.com. 4 NS ns-571.awsdns-07.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0