[SSL] Add certificate approval email error to ca-faq.mdx (cloudflare#23669)

* [SSL] Update ca-faq.mdx

Case 01647724 / SPM-2165

* Text review

---------

Co-authored-by: Rebecca Tamachiro <[email protected]>

Author: 2 people

src/content/docs/ssl/edge-certificates/troubleshooting/ca-faq.mdx

@@ -64,3 +64,11 @@ Universal certificates on free zones only receive an ECDSA certificate. Paid zon
 When [ordering an advanced certificate](/ssl/edge-certificates/advanced-certificate-manager/manage-certificates/), you can choose the CA through the UI or API.
 
 [Total TLS](/ssl/edge-certificates/additional-options/total-tls/) allows you to get full certificate coverage. When enabling Total TLS, you can choose the CA that will be used for all Total TLS certificates.
+
+## Renewal
+
+### Error when clicking `Approve Certificate` on a Certificate Approval renewal email
+
+The full error message is: `An error occurred while attempting to validate your domain. Please try again later or contact support for assistance.`
+
+Check the status of the certificate on the [Cloudflare dashboard](https://dash.cloudflare.com?to=/:account/:zone/ssl-tls). If the status is `Active`, you can disregard this email and the error message.