Resolution
----------

If ACM certificate requests aren't validated within 72 hours from the time of the request, then the requests fail with the "validation time out error". To resolve this error, first [delete the failed ACM certificate](https://docs.aws.amazon.com/acm/latest/userguide/gs-acm-delete.html). Then, [request a new ACM certificate](https://docs.aws.amazon.com/acm/latest/userguide/gs-acm-request-public.html).

To troubleshoot ACM certificate validation issues, see [Troubleshoot DNS validation problems](https://docs.aws.amazon.com/acm/latest/userguide/troubleshooting-DNS-validation.html) and [Troubleshoot email validation problems](https://docs.aws.amazon.com/acm/latest/userguide/troubleshooting-email-validation.html).

Related information
-------------------

[Why is the CNAME record not resolving for my ACM issued certificate and the DNS validation status is still pending validation?](https://repost.aws/knowledge-center/acm-certificate-pending-validation)

[Why didn't I receive the validation email to issue or renew ACM certificates?](https://repost.aws/knowledge-center/acm-email-validation-custom)

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