The toast message may say "Error:" or "This request is not authorized by the specified Access Token".
Unless this is a temporary system-wide or SmartThings Platform issue, the following may help:
This error may be resolved by just "re-authorizing" your Location(s):
- Go to https://app.actiontiles.com/locations and select your Location; then select "Location Settings" (upper right corner ... menu). Then select "Authorize Things".
- Go through the SmartThings Authorize process again. It should not hurt anything and likely will reset the SmartThings Access Token
Customer support service by UserEcho