I want to be able to to turn on my plug when I click the tv activity on my remote and turn it off when I turn tv off, is this possible?
You just need to add the plug at the end of your Harmony activity start and end sequence.
To get the plug to show up in the Harmony App, you have to authorize SmartThings and associated devices in the setup section (app only) of the Harmony App.
While you are at it, it’s good practice to do the same with the mirrored activity switch(es) that shows up in SmartThings. Doing so, you will get instant updates of activity on/off if performed outside of SmartThings.
Cheers, all sorted.