A recent breaking change by SmartThings may cause the child device not responding to on/off action or show correct status in the New SmartThings App.
It may also not discoverable in the new Google/Alexa integration.
If you have NEO Coolcam or MCO Zwave light switch (with 2 or more channel/gang) - please
- Update the code from here.
- Login in to IDE.
- Under “My Devices” tab, find and click on the child device.
- Check the “In Use by” column, if this child device is in use by other apps (e.g. Automations, SmartLightings, ActionTiles, WebCore, etc,) - remove them. This column must be empty before you proceed to the next step.
- Click the “Delete” button to delete the child device.
- Find the parent device of this child.
- In the parent device, click the “Edit” button, and click “Update” button.
- A new child device will be created and it would appears in the new App and Google/Alexa correctly.