I have been trying to resolve this issue for 6 weeks now. With my old S7 the alarm on my phone would also go off on my Galaxy Watch. It was pretty much a "no brainer" set up.
With the S21 the alarm on the phone does not trigger on the watch.
I have just had my wife connect her S20 to my watch and tested and the S20 works exactly like the S7 did.
So what has changed with the S21? Do I just have to roll back to the S7?