In the admin tools go to System -> Notification Helper. Here you can plugin a user, issue and select the notification. It will tell you if the notification will fire or not. If it will not is should identify the issue.
Jira does not report problems and does not send the email.
Note: the email of Creation of the incident arrived successfully
Any other suggestions?
Is this a Jira Software Project or a Jira Service Desk Project?
Jira Software Project
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