I do recall some issues on some sims with regards to this. Some students did a micro second and claimed it did not work.
When you activate the ALT Flaps switch you are starting the SBY HYD pump. If it has been activated you should see the SBY HYD Oil Press light come on and go out. This confirms the pump is running. If it doesn't then it ain't, or the bulbs are broken. There are some later customer options with an extra light saying SBY PUMP.
Blipping switches, e.g. the APU start switch, is not a good idea. Positive action and follow up with other indication to confirm correct activation if possible is a good idea.