I have an existing nagios set up, and notifications work, what I need is a way to test if added users will receive notifications. Aside from just waiting, of course.
I have no reason to think the new people shouldn't, but I'd rather not wait till some error actually happens, that they might miss, to find out.
I have core 4.5.0, Yep older, but it's also on rhel 7.9, which is currently on extended support. A new nagios server is in the works.
You should be able to assign a contact to a host or service, and then test send the notification from within the core web user interface