iphone Settings, [your name], iCloud, (show all)
make sure Health is turned on (green)
If it ever gets turned iff it can take some days to recalculate all your awards and rings at server level.
You should never be afraid to do the following two troubleshooting procedures
Force restart the Watch
i.e. p ess and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo. Then while the Watch is restarting,
Force Restart the paired iphone Force restart iPhone – Apple Support
and
Unpair and set up again
Unpair and erase your Apple Watch – Apple Support
and then set up again - takes about 20 minutes
Set up your Apple Watch – Apple Support