Apex domains cannot have CNAME records.
Question and response
Question
dig accaglobal.com. NS
Answer
accaglobal.com. 5 NS ns-1677.awsdns-17.co.uk.
accaglobal.com. 5 NS ns-718.awsdns-25.net.
accaglobal.com. 5 NS ns-86.awsdns-10.com.
accaglobal.com. 5 NS ns-1428.awsdns-50.org.
Authority
The response has no authority records.
Additional
ns-718.awsdns-25.net. 3 A 205.251.194.206
ns-1428.awsdns-50.org. 3 A 205.251.197.148
ns-1677.awsdns-17.co.uk. 3 A 205.251.198.141
ns-86.awsdns-10.com. 3 AAAA 2600:9000:5300:5600:0:0:0:1
ns-718.awsdns-25.net. 3 AAAA 2600:9000:5302:ce00:0:0:0:1
ns-1428.awsdns-50.org. 3 AAAA 2600:9000:5305:9400:0:0:0:1
ns-1677.awsdns-17.co.uk. 3 AAAA 2600:9000:5306:8d00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0