I wonder if it is a bad switch or a loose wire connection.
You can use a 12V light bulb to verify you have power to the switch if you do not have a multi meter. You should be able to jumper across the switch to verify if the switch is good/bad, once yo know if you have power up to the switch.
Not sure your TT configuration, but my microwave is above the stove hood. A few years back, I removed the microwave, and noticed I could access the wires connections for the stove hood from that cubby.
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