Apex domains cannot have CNAME records.
Question and response
Question
dig mqzgcdqkwq.acm-validations.aws. NS
Answer
mqzgcdqkwq.acm-validations.aws. 5 NS ns-1458.awsdns-54.org.
mqzgcdqkwq.acm-validations.aws. 5 NS ns-1728.awsdns-24.co.uk.
mqzgcdqkwq.acm-validations.aws. 5 NS ns-199.awsdns-24.com.
mqzgcdqkwq.acm-validations.aws. 5 NS ns-626.awsdns-14.net.
Authority
The response has no authority records.
Additional
ns-199.awsdns-24.com. 1 A 205.251.192.199
ns-626.awsdns-14.net. 1 A 205.251.194.114
ns-1458.awsdns-54.org. 1 A 205.251.197.178
ns-1728.awsdns-24.co.uk. 1 A 205.251.198.192
ns-199.awsdns-24.com. 1 AAAA 2600:9000:5300:c700:0:0:0:1
ns-626.awsdns-14.net. 1 AAAA 2600:9000:5302:7200:0:0:0:1
ns-1458.awsdns-54.org. 1 AAAA 2600:9000:5305:b200:0:0:0:1
ns-1728.awsdns-24.co.uk. 1 AAAA 2600:9000:5306:c000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0