Activity on Apple Watch not syncing with activity app
my watch activity is not syncing with the activity app for 5 days
Apple Watch Series 4, watchOS 6
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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
The next steps would be to unpair and pair your watch again and restore from the backup:
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support