I have a sm-r820 galaxy active 2 paired with an unlocked US S21. I've got the health monitor app installed and can read ECG bit the BP says that no compatible watch found. I live in the UK at the moment so is there something region locked that would have impacted my us spec firmware or is there something wrong with my watch?
I have the same Issue with mine as well, buy from the little research I did, if you didn't get your device in the Uk, it might be the reason. I don't know the solution