Apex domains cannot have CNAME records.
Question and response
Question
dig shanon-services.com. NS
Answer
shanon-services.com. 5 NS ns-668.awsdns-19.net.
shanon-services.com. 5 NS ns-1613.awsdns-09.co.uk.
shanon-services.com. 5 NS ns-508.awsdns-63.com.
shanon-services.com. 5 NS ns-1500.awsdns-59.org.
Authority
The response has no authority records.
Additional
ns-668.awsdns-19.net. 3 A 205.251.194.156
ns-1500.awsdns-59.org. 3 A 205.251.197.220
ns-1613.awsdns-09.co.uk. 3 A 205.251.198.77
ns-508.awsdns-63.com. 3 AAAA 2600:9000:5301:fc00:0:0:0:1
ns-668.awsdns-19.net. 3 AAAA 2600:9000:5302:9c00:0:0:0:1
ns-1500.awsdns-59.org. 3 AAAA 2600:9000:5305:dc00:0:0:0:1
ns-1613.awsdns-09.co.uk. 3 AAAA 2600:9000:5306:4d00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0