If people can not hear or feel the coil, does it mean the coil has failed?

No.
If it is double coils, you put it next to each other, you would be able to hear the buzzing.
If it is a single paddle coil like our black Spooky2 coil, people normally can not hear it or feel it.
If they put it next to a large piece of magnetic metal, then the coil may make a buzzing noise.

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