I was able to activate it in the current version of the app by:
- Clicking on the User Icon in the bottom bar
- Clicking on the settings gear symbol in the top right corner
- Click on “Sync with third party services”
- Click on Sync with Apple Health
- On the next xcreen You have to press the orange Go to Health app
- Enable the items you want to sync.
I recommend to leave out steps, if you have any other step counter, e.g. your iPhone, otherwise the steps are counted double.