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To address your question:
- You can add the previous domain "mydomain.com" and wildcard domain "*.mydomain.com" to the ACM certificate in account B. This will allow your application to continue supporting the previous domain names.
- When adding additional domains to an ACM certificate, there is no risk to any other domains or certificates managed in a different AWS account. ACM certificates are scoped to the AWS account.
- You will need to update the DNS records for "mydomain.com" and "*.mydomain.com" to point to the resources in account B, such as the Application Load Balancer. This ensures proper validation of the ACM certificate.
- No changes are needed for the other domains managed in account A using the wildcard certificate. Adding domains to the certificate in account B will not affect any domains in other accounts.
- Verify the ACM certificate in account B now covers both the new and previous domain names before removing the application endpoints for the old domains. This ensures continuous SSL support.
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You will need to add NEW CNAMES to the Zone mydomain.com in Account A in order for ACM to issue a cert for the domain mydomain.com in account B
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