Apple watch heart notification not happening

I NEVER get my heart rate notifications, even though I followed all the steps from the support page, notifications are enabled in the Watch app and the Health app (and in iPhone settings), even though everything is on the latest update, even though the HR notification settings are lower than 50 or higher than 110... and most of my days show between 45 and 130! (and not during the night while in sleep mode). And no, those elevated HR don't happen while I'm active (sadly!).

I'll look at the watch, see my HR at 125... and I get nothing on the watch.

With my old Apple Watch (2nd gen) I would have the exact same problem, except sometimes I'd get the odd notification 30min or more after the fact. Not very useful.

I got this watch in December... and I don't think I got the notification once.

Those notifications are one of the main reasons I got the watch, since I have heart issues (not Afib, just often too high or too low, but not typical arrhythmia), among other health issues. Those notifications could help me a lot.

I'd be very grateful if anyone had the solution... thanks!