For those of you (like me) that had a problem connecting your Fusion to the Activity Tracker Software, make sure you enable Location Services.  That solved the trick for me instantly.

-Mark

Hey Mark - thanks for the info! I'm suspecting that since Marshmallow asks for permissions individually (instead of all at once like previously in Android) we might be seeing more tickets where the answer is "make sure X is turned on", so thanks again for the heads up!