Passing an amber = does not mean you have to extend any flaps at all. It just means you can extend flaps if you want to.
Normally approach sequence goes....
1. Activate approach phase. Autothrust decelerates to green dot.
(green dot around 210kt, amber= 230kt on A320)
2. When below amber = select flaps 1. Autothrust decelerates to S speed.
(S speed around 180kt, amber= 200kt on A320).
3. When you are ready for Flaps 2 (typically just before glideslope intercept) select flaps 2. Autothrust decelerates to F speed.
(F speed around 140kt, amber= 185kt on A320)
4. Gear down (exactly when depends on your judgement of a few factors - winds, altitude, speed etc)
5. When you are nearing the point at which you need to be stabilised, select flaps 3. Autothrust keeps maintaining F speed, Amber= moves to 177kt on A320.
6. Very shortly after, select flaps full (if that is landing configuration), Autothrust maintains Vapp (or GSmini if active) and the amber = will disappear as there is no "next flap setting" from flaps full. (you won't see this on the pfd though, as it will be off the upper end of the speed tape)
7. Call for landing checklist.
Amadis - glad you are enjoying the show