I have a very simple integration which works fine! :-)
I added a new recipient to notify, and clicked Save. This resulted in an error message: "The field [eventStatus, notificationDeliveryStatus, responseStatus] cannot be empty or set to null." This appears to be saying I must select a Two-way Communication option.
This integration has no use for Two-way Communication, and the page says they are optional.
I created a new integration, with four recipients to notify. This too works OK, and sends notifications in all directions (getting my phone very excited), however, if I try to remove one of the notifications, then I get the same error quoted above.
Can someone point out what I'm doing wrong please?