A new Apple support document — first noted by MacRumors — says if you updated to iOS 14 and watchOS 7, you could be missing Activity or Health data such as:
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Your workout route maps are missing in the Fitness app on iPhone for previous GPS-enabled workouts from your Apple Watch.
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The Activity, Heart Rate, or other health-related apps fail to launch or load data on your Apple Watch.
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The Fitness app or Health app fail to launch or load data on your iPhone.
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The Health app or Fitness app is reporting an inaccurate amount of data storage on your iPhone.
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The Activity app is reporting an inaccurate amount of data storage on your Apple Watch.
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Your environmental sound levels data or headphone audio levels data from Apple Watch is missing in the Health app on iPhone.
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Increased battery drain on your iPhone or Apple Watch.
If you experience two or more of the above issues.
Open the Watch app on your iPhone.
Tap the My Watch tab, then tap All Watches.
Tap the info button next to the watch you want to unpair.
Tap Unpair Apple Watch.
Before erasing all content and settings on your Apple Watch, your iPhone creates a new backup of your Apple Watch. You can use the backup to restore your Apple Watch.
