[Kydix]

As i know, there are some issue with old Lumia on Windows 10 preview with sensor core

[Nergard]

I have the Lumia 950 and it is counting my steps but only if I travel a decent distance. If the GPS location doesn't change, for example walking around my small condo, it doesn't register any steps. But when I went hiking on a trail, with mile markers, it counted my steps and got the distance traveled correctly.

[Alexander Long]

The MS health app sometimes will refuse to sync with phone(motion data) alone, if you don't have a band 1/2 paired with the phone. Had that issue with Lumia 830 and 635 too, until have got band to pair with the phone.

[CombatRock]

My motion data still does not work with my Icon with the latest build. Microsoft Health and Fitbit does not recognize the sensor. I have even uninstalled and reinstalled the apps.