@Simon_Willis Perhaps the developers of the Aeotec app have not included the Australian Product Id for the Heavy Duty Switch, only European Product Id.
See this similar topic here regarding the Aeotec Garage Door controller: Cannot include Aeotec Garage Door Opener - #5 by TedTolboom
Read it and when you get to this post by @TedTolboom pay attention.
If you follow step by step you will then be able to include it.
Then to help Athom to include the AUS Product Id into the next Aeotec app release, make a New Issue on Github here: https://github.com/athombv/com.aeotec/issues
Hope this helps.
