Editing the effective date of a policy in the Certificial system will automatically generate and send new COIs to all current cert-holders of that policy. To renew a policy system, navigate to your "Clients" page. Select the "More Options" icon (three vertical dots next to the policy status). In the dropdown box that appears, select the "Edit" option.
All Certificial-registered certificate holders will have access to generate updated certificates at any time.