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The usual things to try when you get syncing issues are:
If none of those ideas work for you then it’s probably best to contact customer support via: contact.fitbit.com
Best AnswerAfter a recent software update for galaxy 9+ the fitbit software cannot find the device and sync. I have to reboot the fitbit charge 3 device by plugging it in and holding the button for 8 seconds each time I want to syn data.it looks like a bug