Yep did that when it arrived on Friday and have been using the workout app as well every day, I get all the data and tracking in the Health app and it's been giving me achievements so I'd say it's setup. Gonna speak to Apple Chat and see what they suggest
Spoke to Apple - Soft Reset of the iPhone and up pops the Activity App
Seriously loving these features so far, it absolutely blows my old Fitbit out of the water. This has been my most active week in a long time; on days I didn't make it to the gym the need to hit my targets even had me running up and down my apartment block stairs to close those rings before midnight!