SmartThings Home Monitor not arming/disarming with automations

[JDRoberts]

SHM is a feature of the classic app. STHM is the similar feature in the new V3 app. These are completely separate, and an automation created in one will not change the armed status of the other. This Has tripped up a lot of people over the last year or so.

See the community FAQ (the topic title is a clickable link)

FAQ: SHM and STHM are different

Just to make sure everybody’s talking about the same thing…This FAQ is for people using both the V2 classic app and the 2018 V3 app, or who have previously used the classic app and have now migrated to the new V3 app. The security feature in the classic app is SHM, Smart Home Monitor. The security feature in the new V3 app is STHM, SmartThings Home Monitor. These are two completely separate pieces of code. Security mode set or changed (or an alert dismissed) in an automation created in the classic app will only affect SHM. . Security mode set or changed (or an alert dismissed) in an automation created in the new V3 app will only affect STHM. So if you have rules you created in the classic app, you will never see those change the security state in the new V3 app. You have to recreate…

So, First things first: are you trying to change the armed status in SHM? Or STHM?

And then either case, can you post a screenshot of the automation that is not working? Then we could help you better.