When a cook cycle is finished, have Alexa make an announcement.
This trigger fires when preheat finished.
This action will make an announcement on your Alexa/Echo device using the text you supply.
Ensure you open the Voice Monkey Skill as the final action in your routine.
Text can be dynamic e.g. an ingredient from another IFTTT event or applet.
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TSmartLife Microwave and Alexa Voice Monkey