An error occurred while validating the server dns
Note: Some DNS providers can take 24–48 hours to propagate DNS records.
If your certificate is in the Pending validation state, you must confirm if the CNAME record provided by ACM was added to the correct DNS configuration.
The CNAME record has been added to the correct DNS configuration, but the DNS provider automatically added the bare domain to the end of its DNS records DNS providers might automatically add the bare domain to the end of the name field of all DNS records.
In this scenario, the propagated CNAME record added to your DNS configuration is similar to the following: The certificate request will remain in Pending validation until it eventually fails.
If this step is successful, your DNS delegation is configured correctly.
The article provides troubleshooting steps for errors that may be shown during a Let's Encrypt certificate installation using the Let's Encrypt Plesk extension.