Intensity Minutes not showing on Vivosmart 4 nor in Connect app

My Vivosmart 4 activity tracker does no appear to be recording my intensity minutes. Scrolling trough the widgets on the watch face after 5 days my intensity minutes are zero. In the Garmin Connect app I have selected Intensity Minutes to show in second position in My Day between steps and heart rate it does not show. What am I doing wrong? Thanks for any help, Linda