Modern Vespa

I have a Vespa Elettrica 45. How do you drive in reverse?!?
When I switch to power / eco / and set reverse and twist the throttle, it switches to eco or power and moves forward.
I've never managed to drive in reverse. What am I doing wrong?

According to the interbwebs, the scooter will typically provide a visual or auditory indicator that reverse mode is active. Is this happening for you?

You have to press the select button for about 4 seconds for the Reverse to change from blinking to solid, you will hear the reverse beep, and then you can go.

But you have to do the same select-and-hold with the select button to go forward too in Power or Eco. It will not present the Reverse selection if you are moving.