I see this posting back '18 so I'm freshening it up here:
I am a recent smartthing refugee and have setup a nice physical button to delay arming while I close the door and lock up. 30 seconds after I hit my button the system arms. and I even have Alexa warn "30 seconds". Works great until...
Wife had to come back through the door during the 30 second delay. She hit the disarm-button which is set to disarm HSM and send a confirmation notification to the phones. Unfortunately the system still armed and she tripped the motions setting off the buzzah.
Can't seem to get over it: How do I cancel the delayed arming?