Connect 2 devices in one Garmin Connect Account

I have a vivosmart and a FR305 in the same account. I just used both in a bike ride. I created an activity in the forerunner and not in the vivosmart and there was no conflict although I imagine there was some double-counting of calories. Where there would be a significant conflict is if both devices count steps as only one device can be defined as the main tracker.

BTW, I also have a vivofit setup in another account. I have the 2 accounts connected so I can see both in the same widget

My Vivofit and FR620 both have step counting ability, but when I run with both devices (I never take off the Vivofit), my steps are not double counted.

Good to know that double counting doesn't occur. Originally double counting did occur, and Garmin had a plan to rectify this. I'm glad to hear they've rectified the multi-device scenario. I might pick up a vivofit2 to complement my Fenix3.

When you have two step counters, you define which is the primary tracker in your account info.