Why doesn't Garmin not credit intensity minutes for swimming?

Which watch model do you own? Not all of them support IM at swimming. There is a list of models supporting it in the article How Does the Intensity Minutes Feature Work? | Garmin Customer Support

Thank you, Trux. My watch is an Instinct Solar, which is on that list. And yet...

I've had Garmin watches for 10 years. But this issue, that inconsistency (they say my watch supports swimming intensity minutes but it doesn't) is one of many reasons I am losing faith in the brand... 

My Instinct 2 does not have any problems with Intensity Minutes during swimming. If you share a link to the activity, I could look at the data, and perhaps find the reason.

https://connect.garmin.com/modern/activity/10059563780?share_unique_id=2

There it is. I swam for 45 minutes or so but I believe the 19 intensity minutes I got that day were for my very not intense ride to and from the pool... 

I didn't think that was possible? How is it giving me active calories burned then? 

How are Calories Burned Calculated For a Swim Activity on a Garmin Watch? | Garmin Customer Support

1281964 said:

I didn't think that was possible?

It is an option at Instinct Solar (not at the non-solar Instinct 1st gen, though)

So apparently it is possible but the default setting for some reason is not measuring heart rate while swimming. So I've turned it on and we'll see how the next swim goes. I find it odd that they have solved for calorie burn when heart rate sensor is off, but not a way to convert that to intensity minutes.

Thank you so much for your help.

Swim captured!