If you are a White Label operator and received an email from Trustico.
There is a thread about this here: https://www.reddit.com/r/sysadmin/comments/80uaq3/digicert_certificates_being_revoked/
You should have your certificate reissued ASAP and submit the new certificate through the control center.
For the CSR, you can use a CSR generator, like this:
Also, be sure that the new certificate is issued by GeoTrust, otherwise you may have problems through the hotspot as described here.
Here is the email from Trustico:
"Trustico reported the private key associated with your website certificate as compromised today. As a consequence, we are obligated by CA Browser Forum requirements to revoke your certificate within 24 hours. Revocation will lead to the immediate termination of your certificate’s functionality. If your certificate is currently active on your site, revocation will cause users to see an untrusted certificate warning.
We do not understand why Trustico reported the keys as compromised or triggered the revocation of your certificate. However, we wanted to give you the courtesy of notifying you that your certificate would be revoked.
If you have any questions about this, please contact us at firstname.lastname@example.org. "