Apex domains cannot have CNAME records.
Question and response
Question
dig iriscrm.com. NS
Answer
iriscrm.com. 1 NS ns-379.awsdns-47.com.
iriscrm.com. 1 NS ns-1443.awsdns-52.org.
iriscrm.com. 1 NS ns-562.awsdns-06.net.
iriscrm.com. 1 NS ns-1709.awsdns-21.co.uk.
Authority
The response has no authority records.
Additional
ns-562.awsdns-06.net. 5 A 205.251.194.50
ns-1443.awsdns-52.org. 5 A 205.251.197.163
ns-1709.awsdns-21.co.uk. 5 A 205.251.198.173
ns-379.awsdns-47.com. 5 AAAA 2600:9000:5301:7b00:0:0:0:1
ns-562.awsdns-06.net. 5 AAAA 2600:9000:5302:3200:0:0:0:1
ns-1443.awsdns-52.org. 5 AAAA 2600:9000:5305:a300:0:0:0:1
ns-1709.awsdns-21.co.uk. 5 AAAA 2600:9000:5306:ad00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0