@josh I am having problems with the mobile app with subscription to events for tasker. I am encountering this error 400 trying to unsubscribe or resubscribe to a thing. I have added and removed it using SmartThings and I am still getting the error.
Can you clarify what you’ve added and removed using SmartThings?
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Have you checked the SmartThings IDE live logs while you attempt to subscribe or unsubscribe? The error messages are generated there and usually provide some insight.