After configuring a custom domain and verifying the correct CNAME is used, the verification on the custom domain does not finish, and the status is Status: Pending Verification.

• Custom Domains
• Pending Verification

If the custom domain is tested multiple times, it can hit the Duplicate Certificate Limit.

If an Auth0 managed custom domain is deleted and created multiple times within a short period, it can hit the maximum number of certificates that can be issued. The same can occur if multiple tenants are configured around the same time with the same parent domain.

Provided that the CNAME is correct and in place, the certificate should be allocated within a couple of days. Using a command like the following, the status of the certificate can be checked. 

openssl s_client -servername <YOUR_CUSTOM_DOMAIN> -connect <YOUR_CUSTOM_DOMAIN>:443

Once a valid certificate shows on the response for the domain, pressing the verify button should complete the verification.

Contact Auth0 Support if issues with the verification of the custom domain continue.