Need tables to get the errored alerts recipients

Summary:

We have created the custom alerts for learning application in HCM. It will send the overdue learning notification to users who hasn't completed the course within 7 days. The alert has failed to send the notification for few employees who missed to take the course. We are trying to create the BI report to get the email recipients to whom the notifications are not sent, based on that we will send the notification to their emails. We need assistance on the table names where the error-ed alerts recipients are being stored.

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