Ultrawatch 2 and heartrate
I’m finding in open water swims, HR is not detected and therefore doesn’t show on Strava. Disappointed, as my much cheaper Polar watch was super accurate. Any fixes or updates on the way?
Have you tried to restart the watch to see if the issues persist?
If the issues persist, are they only happening on open water swims or also on other workouts? If it is occurring on other workouts as well you might need to set up hardware service for your watch
If it Is only at the open water swim, you might want to give this as feedback to apple so that they can look in to it, do so using this link