I tried uploading it to my published game that's on the play store as an alpha build. Used the same keystore as the original app published and still got the "*Unknown Error." "Login Failed"
Maybe I am missing something in Intel XDK? All I am doing in XDK is adding the copy/paste to the additions.xml and changing the "YOUR_GOOGLE_PLAY_ID section with the right numbers.
I don't think I am missing anything in Construct 2, but I guess I can go back and look there, too.
This is the only thing that's holding me back
Thanks for the responses cranberrygame and I am sorry if I have become annoying.