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The usual things to try when you get syncing/connection issues are:
Best Answer… or, alternatively, if your android is on Pie (ie Android V9) then you could have a skim through this thread (nearly 100 pages) which basically says there are problems with phones using Pie connecting to and syncing with some fitbit trackers
https://community.fitbit.com/t5/Android-App/Android-9-0-Pie-not-able-to-sync/m-p/2884861#M82160
Best Answer