I'm having a lot of issues with scheduled messages. I have several templates which I send to guests (check-in info, check-out info, feedback request...) and I tried to use the scheduling feature once I discovered it only to find out that the scheduled messages are not being sent.
These are my issues:
1. Scheduled messages disappear from the list of messages I can send manually. Why? If scheduling does not work it would be best if I can at least send the message manually
2. Un-scheduling not possible: if you activate scheduling, there is no option to deactivate it. The only way back it to delete the message and write it from scratch
3. Freezing: I had a scheduled message with a link to a few pictures (a google doc album) where the guest could see the location of the keybox. Once that message was "scheduled" any time I tried to edit it the whole browser window would freeze (I tried different browsers, same issue). Luckily I managed to delete that scheduled message using the android app on my phone.
Conclusion: scheduling does not work and it is best left alone for the time being. I rather send my messages manually than rely upon this highly unstable service for now.