@martintrail same problem:
Hammerhead Karoo 2 with Firmware Version 2.9.9
Suunto does not take heart rates or Energy output into calculation.
It is also missing in the “Suunto Coach*BETA” - for example “cycling performance”, “impact” on “Cardio” or “Muscles” can not be taken seriously due to missing effort data…
Sadly, strava makes it much better at this point: it calculates missing data and enables deep insights based on available data. This might also be the approach/workaround for SUUNTO to get a grip on the partner connection error.