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Ah I see, yes app/web OTP is one of the best methods, unless people are calling to report the app/website not working (a workflow I’ve seen many times) The industry has put hundreds of millions into voice recognition but the sample size required for AI to trick voicerec is really low now.
We have two doors that go into the garden, one in the dining room one in the kitchen, if we let our rescue Collie out of one she will wait by the other to be let in. Collies are smart, ours is defective.