In January 2021, SmartThings released the official integration with Google Nest devices, including thermostats, cameras and doorbells. This is a huge win for both SmartThings and Nest users. Congratulations to people who worked to make this happen!
Unfortunately, at the time of writing, it looks like the new Nest devices are not exposed to any 3rd party app integrations. Nest devices are not listed in the IDE nor Classic API or New API.
It seems that Nest integration is locked down to work only within the SmartThings mobile app. At this time we don't know if it's permanent or whether there are any workarounds.
We understand the value of bringing your Nest devices to ActionTiles and will make all efforts to make it happen. We will provide more information as it becomes available.
Customer support service by UserEcho