Nest Home Master - Comm Disabled?

Hello, I've just installed the plugin - it's great btw! - and it seems to be working well, I've been able to integrate its data and "actions" into my existing Indigo pages and action groups. But, I can't seem to get the Away status to change. The Away Status is controlled through the "Master" device only, right?

When I try to set the Away status, the log entry tells me this:

Ignored device "NEST Home Master" action request (communication is disabled)

And, when I try to enable Indigo communication to the Nest Home Master device, I can't do it, even though everything else is working properly.

Does anyone have a recommendation? I've tried reloading the plugin, restarting the Indigo server, no luck. I'm running Indigo 6.1.4 on El Capitan.

Thanks!

--Joe