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Hi @LucyBonnie @TMFCCA - versions of the new app has syncing issues, may be this will work for you.
Remove watch Bluetooth entries from the phone (in case they are corrupted), needs only be done once per app version.
Logout of the Fitbit App and swipe off the active window and in Android clear the storage cache and force stop it and then restart the phone.
Make sure there are no other devices running the Fitbit App switched on, or other watches that can interfere in the syncing process.
Restart the watch by holding the button for 10 seconds till it vibrates and the logo appears and wait for it to start.
Login and wait for any pair, link or Fixit prompts and sync.
If necessary minimise the app and click the sync popup, or in the Fitbit App run the "Set up a Device" and replace and sync.
Author | ch, passion for improvement.
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