Epix 2 "Symbol Not Found Error" for ActivityMonitor.getInfo()

What import / using lines do you have in that mc file?

using Toybox.ActivityMonitor as ActivityMonitor;

It works for other watches

Very strange, especially because even even the oldest Epix 2 should have this api.

I tried the latest SDK (4.1.2) and it behaved the same. Restarted the IDE environment and it's now working. It was something wrong with the Simulator. Should have known to restart it.

Yeah, that was it.

If you look at the change log in the 4.1.2 SDK, for simulator changes you see this:

• Fix an issue where simulator could be using wrong device configurations when loading multiple devices without closing the simulator in between app runs.

This was the fix for this problem.  When ever you change SDKs you want to close the sim and let your next run open the sim for the SDK you are using.