Lucidity is caused by awareness. An alarm going off during the day that reminds you do to a reality check can be helpful, as long as you also practice really questioning if you're dreaming or not (along with looking at what's around you and reasoning out why you're dreaming or not). If you only go through the motions and don't partake in the mental aspect of reality checking, you won't get very far, but it's very easy to simply observe your surroundings closely and see if what you're doing makes sense.
In the dream, an alarm on its own won't do much good. Like imj said, you'll end up ignoring it because you're not aware enough to realize it's prompting you to do an RC. The alarm may also disguise itself as another sound, or associate itself with something else (eg. the alarm beeping could come across as the timer on an oven going off). You'd have to be practicing awareness in waking life to even be able to recognize the alarm, but awareness alone will already cause lucidity. In short, there's no longer any purpose to the alarm.
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