Symptom. The user cannot find the identity email, and the administrator wants to confirm it was sent.
Cause. The email may have failed at the provider level, or the user may be looking in the wrong organisation's log.
Fix.
Go to Settings > Notifications and open the Deliveries tab.
Look for a delivery row with the recipient's email address and a kind such as Identity Email Verification, Identity Sign-In Code, or Identity Password Reset.
Check the Status column. If it shows a failure, contact support with the recipient address and approximate time.
Because identity emails are account-level messages, the delivery row appears in every organisation's log where the recipient is a member. If the user belongs to multiple organisations, check the log in any of them.