For a second DomiNations account from the same device you need to create a second user account through your system settings. From there, register your second user account with a second (individual) googleplay account. Reinstall the app from google play as you did on your primary user account on your device. Now you can switch between your two user files with their respective game files. (don't try it on a "guest" user account it gets funky.) - I apologize if this was confusing it's my first post-
I'm getting this same problem. Anyone have any tips?