AWS Certificate Manager (ACM) was unable to renew the certificate

I am getting an e-mail notification from AWS saying "AWS Certificate Manager (ACM) was unable to renew the certificate automatically using DNS validation. You must take action to ensure that the renewal can be completed before ........UTC. If the certificate is not renewed and the current certificate expires, your website or application may become unreachable.

To renew this certificate, you must ensure that the proper CNAME records are present in your DNS configuration for each domain listed below. You can find the CNAME records for your domains by expanding your certificate and its domain entries in the ACM console. You can also use the DescribeCertificate command in the ACM API[1] or the describe-certificate operation in the ACM CLI[2] to find a certificate’s CNAME records. For more information, see Automatic Domain Validation Failure in the ACM troubleshooting guide[3]."

When I following the guides it describes validating the CNAME in my DNS. I can find the CNAME in my ACM and in Route53, but I am not sure how do actually do the 'validate'. What action do I need to provide. Thanks