Often, I’ll need to go into the Watch app to try and force the sync, but this doesn’t always work. Also, the Fitbit app will say it’s syncing, but the Watch app won’t, and vice versa.

Compete against multiple people regardless of the device and fitness tracker they are using with the Challenges app. The ...

Try to determine where your phone was at the time of the last sync, and concentrate your search there. Take the phone that you've paired with your Fitbit and bring it to where you might have last ...