So I have Event:  TicketCustomerUpdate, State: closed successful, closed unsuccessful, merged, open, pending close+, pending close-, pending reminder, and removed.
The Recipient is still "Agent (All with write permissions)".

But, I'm not receiving notification of any of the followups. I started to assume it may have been a race condition with changing the State from new to open the first time, so I followed up a second time after it was "open". This didn't work, subsequent customer followups are not generating notifications.