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Here are things you can try:
https://community.fitbit.com/t5/iOS-App/App-not-syncing-properly-with-Flex-2/m-p/2431934#M77801
ALAN | VAN,B.C. Canada Community Council Member
Versa, Charge, Charge HR, Ionic, Ace, Aria 2 scale, Flyer headphones - iOS
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