I don’t receive low heart rate notifications for Apple Watch 6. I used to receive the notification with Apple Watch 4
I don’t receive low heart rate notifications on my Apple Watch 6 while I did with series 4
Apple Watch Series 6, watchOS 8
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If things are set according to the 'High and low heart rate notifications' section in:
Heart health notifications on your Apple Watch - Apple Support
then 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 should result in no loss of data. It 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