I have a Garmin Vivoactive 3 and use an external HR Monitor (Wahoo Tickr X) to record heart rate. Whenever I start an activity, "External HR connected" message shows up on the watch and I can see the recorded heart rate and relevant graphs in Garmin Connect later.
For the pool swim, however, I do get the connected message but I cannot see any information at all about heart rate in the Garmin Connect activity!
Is there a way to see this piece of information?