Use the Ecobee plugin and in a few Reactor actions, I have the Ecobee Mode selected as ‘Device Action’ → ‘Ecobee Mode Reference’ → SetClimateHold??[E]. Prior to the Reactor 3.4 Hotfix, I was setting the mode to either ‘Home’ or ‘Away’ and the values presented showed the text and then saved as the integer number. However, this now just says ‘SetClimateHold??[E]’. So something changed.
The device does expose variables such as ‘currentEventType’ and ‘currentClimateRef’ to set a ‘hold’ or mode to ‘home’, respectively. Dont appear to be able to make such changes anymore.