Apex domains cannot have CNAME records.
Question and response
Question
dig wggjkglgrm.acm-validations.aws. NS
Answer
wggjkglgrm.acm-validations.aws. 4 NS ns-106.awsdns-13.com.
wggjkglgrm.acm-validations.aws. 4 NS ns-1664.awsdns-16.co.uk.
wggjkglgrm.acm-validations.aws. 4 NS ns-1074.awsdns-06.org.
wggjkglgrm.acm-validations.aws. 4 NS ns-531.awsdns-02.net.
Authority
The response has no authority records.
Additional
ns-106.awsdns-13.com. 3 A 205.251.192.106
ns-531.awsdns-02.net. 3 A 205.251.194.19
ns-1074.awsdns-06.org. 3 A 205.251.196.50
ns-1664.awsdns-16.co.uk. 3 A 205.251.198.128
ns-106.awsdns-13.com. 3 AAAA 2600:9000:5300:6a00:0:0:0:1
ns-531.awsdns-02.net. 3 AAAA 2600:9000:5302:1300:0:0:0:1
ns-1074.awsdns-06.org. 3 AAAA 2600:9000:5304:3200:0:0:0:1
ns-1664.awsdns-16.co.uk. 3 AAAA 2600:9000:5306:8000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0