heart rate history doesnt show
The heart rate history on my iwatch 3 doesn't register on iPhone.
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To see your heart rate data, open the Health app, tap the Browse tab, then tap Heart. Learn more about accuracy and limitations of the heart rate sensor.
Also see step 5 in:
Get the most accurate measurements using your Apple Watch - Apple Support
"If you turn off Heart Rate in Privacy settings, you also won't get a heart rate measurement. To see if Heart Rate is off or on, open the Apple Watch app on your iPhone, then tap Privacy."
If none of the above helps, the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support