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Say my opponent has an ability that triggers when they play an Action. They play a blue action, but I reveal Jam Signals to scrap it with no effect. Does their other ability trigger?

Yes. Although the blue action itself will have no effect, your opponent still played an action, so the other ability will still work.
Source: Wizards of the Coast (2019-11-08)    【Link to Ruling】
Tags: Jam Signals