On your Android ... incoming notifications to your computer. It also supports incoming and outgoing phone calls. Everything is done locally. There is no cloud sync. There are no privacy issues ...

It can be seamlessly connected with Windows PC, Linux, and Mac. The app features server detection and supports encrypted password protection. Once installed, connect your Android phone via WiFi or ...

Before you try any specific troubleshooting for your phone or computer ... steps apply for Android, though the exact procedure will vary. See if the Fitbit will sync after each step.