Below are the steps to enable the Consolidated Notification (CNF) reminders.
Step 1: Go to the Settings > Legal Hold> Consolidated Notifications > Edit.
Step 2: Click on the Reminders tab and enable the Set Reminder and enable the Requires Acknowledgement and enable the Set Resend Reminder to On so when the CNF is issued after enabling the reminder the custodian will receive the resend reminder when the custodians didn’t acknowledge the CNF after the mentioned Interval (days).