Hello ,

Thank you for posting your question on the AWS Repost, my name is Rochak and it will be a pleasure assisting you with this today.

I understand you are getting “Pending Validation” when requesting ACM Certificate. Please, let me know if my understanding is incorrect.

Please kindly note that this happens when ACM requires additional information to process this certificate request. This happens as a fraud-protection measure if your domain ranks within the Alexa top 1000 websites. [1][2]

We also might need to whitelist your domain if it indeed falls within Alexa's top 1000 websites list, for which you would need to reach out via a support case. To do this, you would need to subscribe to a proper support plan for us to troubleshoot this issue much further to dive deeper into the root cause of it. So, please open a support case with our AWS Support team. AWS support includes various tier that you can select from depending on your business needs.Your case will be directed to ACM team and ACM support engineer will be able to help you resolve this issue. [3][4]

I hope this helps. If you need further info, let me know in the comments; otherwise I'd appreciate if you mark my answer as "accepted".

Kind regards, Rochak from AWS

References:

[1] Error message: Additional Verification Required https://docs.aws.amazon.com/acm/latest/userguide/troubleshooting-failed.html#failed-additional-verification-required

[2] Alexa top 1000 websites https://docs.aws.amazon.com/AlexaTopSites/latest/index.html

[3] Sign Up for an Aws Support Plan https://aws.amazon.com/premiumsupport/knowledge-center/sign-up-support/

[4] AWS Premium Support https://aws.amazon.com/premiumsupport/