Install the Fitbit app on your device. If you purchased a new Fitbit tracker, you likely installed the official app on your smartphone, tablet, or computer to set it up. However, if you received a Fitbit second-hand, you may not have. Unlike other devices, a Fitbit requires installing a special app to connect to another device and sync data.
Update your Fitbit. The device may have trouble connecting to the tracker if it's outdated.
Only sync the Fitbit to one device. It may seem like a good idea to pair your Fitbit tracker with your iPhone while out of the house and your Windows 10 computer for when you're at home, but this can cause a conflict for the tracker when it tries to connect to both at the same time. The best way to fix this is to turn off Bluetooth on one device when trying to sync to the other. You can also turn the second device off completely.
Turn off Wi-Fi. Sometimes having a smartphone or tablet's Wi-Fi and Bluetooth turned on at the same time can prevent each of these technologies from working properly. If you're trying to sync a Fitbit tracker, this can hinder the Bluetooth connectivity and prevent it from syncing.
Charge your Fitbit battery. While Fitbit trackers have a long battery life, these devices need recharging every day or so. If a tracker isn't syncing, it may have run out of power and turned off. This is likely if you own a Fitbit One or Fitbit Zip. These are usually placed in a pocket or bag and are easy to forget about when it comes to device charging time at the end of the day.
Regards,
Will
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