It would be really helpful to be receive a notification that the check-in instructions were not sent to a guest. This may be a little tricky because sometimes the check-in instructions includes extra conditions like, the pre-arrival form is completed, the rental agreement is signed, etc. So if a guest does not do those things, the message will never be scheduled, and hence, this is not a case of a failed trigger because the trigger is preventing the message from going out. Rather, it would be great to have a condition, somehow, that can be set so that the guest is supposed to get the check-in instructions two days before, but is either not scheduled to get it because of incomplete conditions, or that they just did not get it sent, regardless of the conditions. This allows us to review the guest to see why they did not receive the check-in instructions and send it manually if needed from the inbox.