I had a Fenix 6 Saphire and the sleep score showed normally on the Garmin Connect. Now I have a MK2i and I see the sleep score on the widget, but don`t show on Garmin Connect. My device and app are updated.
I sent Garmin an email with this problem, but this support is terrible. You could send another email. We have to force the support to fix this and another problem.