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There is a bug with android app version 3.37 that Fitbit have been investigating. See the main thread at
https://community.fitbit.com/t5/Android-App/Syncing-Issues-on-Android-3-37/td-p/4691393
Recent posts suggest that a new version - 3.37.1 - is rolling out and that this fixes the problem
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more