I am not aware of a bug in Nagios XI relating to notifications. However, there can be other settings that disable a particular notification.
Are you able to send a test email to the same account? Navigate to the Configure section of XI using the top bar > click My Account Settings under More Options on the left pane > then click Send Test Notifications under Notification Options > and click the button that says Send Test Notifications on that page.
You may also want to check other related configurations to see if the service is inheriting that setting from another.
Object Inheritance
Troubleshooting Notifications in Nagios XI
It never hurts to send ( PM ) us a profile either! We can find lots of information about your system in there. You can download the profile by navigating to System Profile under System Config on the left pane > and clicking the Download Profile button on that page.
Nagios Service is not sending emails
Re: Nagios Service is not sending emails
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