The data might be not syncing on iOS when you didn’t provide required permissions to Bayzat to read the data from Apple Health app.
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Make sure that Apple Health app is recording your activity: Health app >> Show All Health Data
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Check if you allowed Bayzat to read required data: Settings >> Health >> Data Access & Devices >> Bayzat >> Turn On All
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If all data points are enabled, try to Turn Off All and then Turn On All