fēnix 6s LAP BUTTON NOT WORKING (WARM UP, INTERVAL)

So I am following the instructions below from the manual and when I press * LAP * it does NOT begin the first interval (after the warm up), hitting the lap button takes it back to my CLOCK FACE screen out of the activity!

Can someone else with a 6s try to set up INTERVALS with the WARM UP option turned on and try hitting the LAP button to go from WARM UP to the first interval and see if it works on your 6s?

My LAP button is working as a BACK button in this case but not a LAP button!

Starting an Interval Workout
From the watch face, press Start button.
Select an activity.
Hold MENU.
Select Training > Intervals > Do Workout.
Press Start button to start the activity timer.
* When your interval workout has a warm up, press LAP to begin the first interval.*
Follow the on-screen instructions.
After you complete all of the intervals, a message appears.