In the list of certificates, choose the Certificate ID of the certificate you want to validate. This action opens a details page.
3. In the Domains section, choose Resend validation email, select each of the domains requiring validation, and then choose Resend. The Successfully resent validation emails banner should appear.
Replace Expired ACM Certificate
Create a new certificate using the previous one as a template (i.e. so it covers codeocean.[domain].com and *.codeocean.[domain].com)
Redeploy Code Ocean with the new certificate ARN in the CloudFormation's parameters and leave the rest of the stack as it is.