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Fitbit Flex not syncing or updating

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I bought my first Fitbit yesterday. It won't sync to my iPhone or update. I keep getting a Domain 18 Bluetooth error. I've turned off Bluetooth and back on, rebooted my phone, and reset the tracker about 5 times. It still isn't working. 

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Unfortunately there seems to be a system error at the moment that's causing these domain 18 errors. Keep an eye on this thread which has the latest updates from the moderators:

 

https://community.fitbit.com/t5/iOS-App/FBBluetoothErrorDomain-error-18/td-p/2140702

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