I am having an issue registering my custom CNAME, how can I fix it?

You could occasionally run into problems adding your CNAME to your DNS Manager. The absence of a CAA record may be related to this.

To indicate that AWS Certificate Manager (ACM) is authorised to issue a certificate for your domain or subdomain in that situation, you can optionally set a Certification Authority Authorization (CAA) DNS record. ACM validates your domain and looks for CAA records to ensure that it can issue a certificate for you.

[Add CAA Record for mycompanydomain.com]
mycompanydomain.com . CAA 0 issue   amazon.com
mycompanydomain.com . CAA 0 issue   amazontrust.com
mycompanydomain.com . CAA 0 issue   awstrust.com
mycompanydomain.com . CAA 0 issue   amazonaws.com
mycompanydomain.com . CAA 0 issue   wildamazon.com
mycompanydomain.com . CAA 0 issue   wildamazontrust.com
mycompanydomain.com . CAA 0 issue   wildawstrust.com
mycompanydomain.com . CAA 0 issue   wildamazonaws.com