ACM SSL Certificate for custom domain validation timed out (not Route 53)

Hi There

There could be a few reasons why this is happening including

• The CNAME record isn’t added to the correct DNS configuration.
• The CNAME record has additional characters or is missing characters.
• The CNAME record added to the correct DNS configuration, but the DNS provider automatically adds the bare domain to the end of its DNS records.
• A CNAME record and a TXT record exist for same domain name.

Please follow the steps in this troubleshooting guide: https://aws.amazon.com/premiumsupport/knowledge-center/acm-certificate-pending-validation/