How do I get Bixby Voice Password?

I have a Galaxy S8+ with Bixby and Bixby Voice, and I want to use the voice password, but I have no setting for it. I've had a S8+ in the past that had the setting, and so I know where to find it  but with this S8+ the setting is nonexistent. I've tried looking it up and updating Bixby but it's up to date and nothing has helped me. Any suggestions? 

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