Activity does not work
After upgrading my watch to watchOS 7 Activity and Heart Rate stopped working.
On watch it is in “Loading...” all the time.
It seems like after the upgrade the green LED stopped working...
Apple Watch Sport
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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. 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