I had the same problem and after combing through all the official ways to fix this and having none of them work, all I did was the following in the iPhone Fitbit mobile app :
I'm hoping this works with other models.
This also worked for me - thanks
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Best AnswerSame problem here, however synch does work on my MacBook and iPhone XR. But unable to sync with iPad 11” (always has) don’t really use other devices to check steps, miles, etc. Frustrating reset idea didn’t work either. Might be a Bluetooth issue on Fitbit’s end we’re not alone looking at product boards, but phone is working and data updates to iPad after sync.
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