Symptoms
Unable to issue Digicert GeoTrust certificate using SSL It! extension. The below message persists under Domains > example.com > SSL It!:
The certificate is being issued
Cause
Since this is an OV/EV certificate ir requires a public phone number available as described here.
Resolution
Follow the instructions from https://docs.digicert.com/manage-certificates/organization-domain-management/tls-certificate-organization-validation-process/ to complete the validation process.