If your app is not syncing check if your internet and Bluetooth on your phone are switched on.
To sync your data to your app you need to make sure that your phone and your device are close to each other.
Also ensure that your device has enough battery. Now swipe down on the screen to do a sync. The app will tell you that it's syncing.
If this does not help, please contact the Philips Consumer Care team on 1-844-531-6861 (free number). The phone number can be reached from Monday – Saturday 9am - 9pm EST and Sunday 9am - 6pm EST.