One thing I see is that the event_handler cron job is not running so run this and see if the notifications start to run
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service crond restartCan you re-download a new copy of the XI tar file and try reinstalling it again?
Here is the link to it.
https://assets.nagios.com/downloads/nag ... .11.tar.gz
Try that and see if the error from the event_handler.log file is gone and that the email notifications are sent.