Hello,
I've found that in one of our projects, customer notifications are not sent out if there is not a request type filled in on the issue.
As to why there would not be a request type, this happens when users create an issue using this create button:

I'm not sure if this is by design, or if there is a server processing error that occurs if there is no request type on the issue. We have customer notifications turned on in the project, so I am under the assumption that the notification should be sent out regardless of how the issue was created.

Any help on this would be appreciated
Thanks!