EventGhost - Device Key Error

Hey,

I'm looking to (as many other people are) to power my computer on/off through Google Assist and I'm stumbling at EventGhost. I've looked through other forums posts where I know I need to enter my Device Name but for the Device Key on AutoRemote Plugin, is that the API Key through the Join app or do I also need to download AutoRemote on my Android Device to generate a key from there? I'm asking this because when I register on the AutoRemote Plugin through EventGhost and attempt to Test I get the following response on EventGhost...

Got Public IP : XXX.XXX (Its the correct IP)
Calling url https://autoremotejoaomgcd.appspot.com/sendrequest
Result from sending request: Your key is invalid. Please check your key and try again.

I'm pretty sure this is the last hurdle so any help would be greatly appreciated!

Thanks,

Rory.